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"They all are, I mean 10.4, 10.5 and 10.6 are all rock solid."

In complete agreement here.

I started with 10.3.2 on a PowerMac g4 tower (still using it, typing this message on it now), and "moved up" to 10.4.11 -- stable as a rock.

I started on my iMac with 10.4.11 and moved up through 10.6 and am now experimenting with 10.7 as well. ALL have been rock-solid.

Stability is less of an issue with the Mac OS, vis-a-vis which version of the system most fits your needs (example: someone who relies on Rosetta-based apps could probably stick with 10.6.x for the foreseeable future, without problems).
 
10.4.10, 10.4.11, 10.5.8, 10.6.6+ are versions I've never had any issues with that could pre traced back to the OS.
 
OS wise, 10.4 treated me the best. 10.5 has hiccups - but all the freezes I can recall spawned from Parallels 19 times out of 20.

10.6 actually ranks low in my eyes - as my Mini (shipped with 10.6) has crashed 5 or 6 times in a single month, and that thing has only been a media PC. Whether it's hardware or OS related, not sure - and don't particularly care, however it did stop me from moving to SL on my other Macs...
 
I've used 10.5 and 10.6 on a Macbook Pro and they were both equally as stable and solid. I've only had a few crashes on Leopard but it only crashed once or twice when using a notoriously poorly made app. I can't even recall having a crash with 10.6

Although I can't speak from experience, I hear that 10.0-10.2 weren't perfect.
 
Snow Leopard by a MILE. I had massive problems with 10.4 but that could've been due to the fact that I was a n00b back then 😛. No end of issues.

Leopard was horrible, I couldn't stand it. I just found it sluggish and slow. Shouldn't have done an upgrade really but at the time, I didn't have an external hard drive and was worried about losing all my music.

Then I bought Snow Leopard and was like 'Holy hell this is solid!' and that was on 10.6.1 (clean install as had got an external HD by then). All of these installs were done on a late 2006 2.16GHz White 24" iMac.

When that died, I upgraded to the machine in my sig and have had never had a serious problem. *touch wood*.

I guess it boils down to how you install.
 
For me 10.4.x was solid but 10.5 had weird networking problems until 10.5.5. 10.6. has been rock sold after I did a fresh install of 10.6.

I just wish Apple would update their version of Samba. However I heard that 10.7 will not have Samba because of some GPL issues. I just sure hope Apple gets something rock solid in 10.7 speaking with Windows Domains because it will really help in getting Macs into companies.
 
I've been using it from the get-go. Had a dual OS 9 / OS X boot on my 533 G4 tower. So going back from the beginning it has seemed to gain stability pretty much consistently. Sure there were some point releases along the way that kind of sucked, but all in all it is a stable OS.

I have had very few complaints since OS X 10.4+

Have been getting random kernel panics lately on my tower but that is happening in my Matrox audio driver while working in FCP and transferring TB's of data at the same time. I just stopped editing if I needed to transfer data and vise-versa. Other than that SL has been solid for me.
 
I would also like to nominate 10.4.11 as the defending OSX release, with the fewest complaints or issues.
You can also say 10.6.7 or if we get a 10.6.8 will be a very stable and refined version.
 
10.6 just KP'd on be yesterday. I'd have to go with 10.3 or 10.5, as 10.4 wasn't sufficiently stable until after 10.5 came out... and 10.3 was rock solid, although perhaps not as feature-rich.
 
10.5.8 so far gives me no issues

Seconded

I'm running 10.5.8 on a 24"/2.8ghz iMac 8,1 with 2GB of RAM and the Radeon 2600HD graphics card and I prefer Leopard over Snow Leopard.

I had 10.6.7 installed for a while but found video performance and GPU intensive tasks were bogging the machine down. I did a test where I opened about six QT movies and had them playing simultaneously. Under 10.6.7 playback was erratic and "jerky", whereas under 10.5.8 playback was even and smooth. SL also raised temps by 5-10 degrees Celsius across the board.

10.5.8 is optimal for a 2008 vintage machine and I won't be upgrading the OS until I purchase a new computer.

I'm not too keen on 10.7 from what I've seen/heard/read so far. Seems like too much dumbing down and iOSification, and few real innovative and useful new features. Apple needs to overhaul and update its OS and keep iOS and OS X as separate entities if it wants to be taken seriously as a COMPUTER company.
 
... Apple needs to overhaul and update its OS and keep iOS and OS X as separate entities if it wants to be taken seriously as a COMPUTER company.
You need to watch the video of Apple's WWDC presentation then go through all of the material on Apple's Lion and iOS 5 webpages if you want to be taken seriously as a member of this forum.
 
Apple needs to overhaul and update its OS and keep iOS and OS X as separate entities if it wants to be taken seriously as a COMPUTER company.

With respect, what a load of rubbish! You are completely missing the point of Apple's objectives.
 
In my experience, the most stable has been Tiger, from 10.4.6 onward. I never had a KP while on Tiger, and can't remember any programs crashing.

10.5.8 was/is pretty stable. GETTING to 10.5.8 was an entirely other story. The update from 10.5.7 to 10.5.8 was a real PITA.
 
I'm not too keen on 10.7 from what I've seen/heard/read so far. Seems like too much dumbing down and iOSification, and few real innovative and useful new features. Apple needs to overhaul and update its OS and keep iOS and OS X as separate entities if it wants to be taken seriously as a COMPUTER company.

10.7 doesn't take anything away from Snow Leopard (it handles spaces differently, and in a way some people don't like, but they are still there) and adds some great new features that I find really useful. if you don't want to use them, then you don't have to and you can continue to use your Mac in pretty much exactly the same way as you do now, so I don't see how that is a "dumbing down" at all.

Back on topic, I think pretty much all OS X version after and including 10.3 have been stable eventually, but some of them took a few point releases to get there!

My first experience of OSX was (IIRC) 10.0.4 when it came included along with OS 9.1 on an iMac I bought in 2001. That was pretty unstable 🙂
 
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