One is not better than the other. They each will have their fans. I think LR streamlines your raw workflow while Aperture has better UI and cataloging. But Aperture needs some high end hardware so many people will not be able to use it. LR will run on "anything"
This is about the same conclusion that I have arrived into.
Working as a prophotog, I run some quick testes on Aperture and LR.
Ended up using the LR beta for,what,6 months now?
Theese programs definately have their place in the professional enviroment.
One suprising thing that came up with collegues,was that how
little people use the central library in both programs.
Seemed that of the about then photogs, 8b]1[/b] used the library, others disabled it or skipped it..
For me,it only uses space and slows down in the long run (I shoot from 5-50GB a week).
Because everyone of us has a personal archiving system (me:year,date,client,case) with several backups, and with minimal re-use of shot pictures, the library is quite futile. I can find the pictures as fast from the archive than the LR takes to wind up,let alone aperture.
And the central library thing is confusing, it doesnt create transparency to the user,what stuff
are backed up,and what isnt.
Especially the apertures central library has a very,very disaster prone aura around it... No one that I know trust it and they treat it with great suspicion.
So, in short, for many pro-photographers LR or Aperture is just a sorting+raw converter tool with no use to library
Wich is okay,because LR in my example has speed up my workflow tremendously compared to Canon Raw or Adobe bridge.
AND I get way better results.. Canon raw,and especially Bridge is inferior in developement quality of RAW pictures. But Lightroom has its own flaws too,especially with tungsten lighter pictures. I propably will try out the PhaseOne wich supposedly is a bit better on that area.
Both are flawed and have their quirks, but are getting slowly there.
I just see it as getting the program that suits ones workflow better.
Or wich one runs on ones machines better...
Aperture is a hog with its library,but LR (beta 3,4) have problems running in G5s and MBPs...
It is just for the people to use both and then decide wich one suits their workflow best.
Simple.