everything's different...
ok, my two cents....
Bang & Olufsen is not comparable to Apple, B&O is nicely designed but way way overpriced. when you compare the say, beosound1 which costs $1,250, to the Bose Acoustic Wave which costs a grand the Bose wins hands down. The B&O doesn't even have a line in for the iPod, this you have to buy separately. There's no low range.
I also have some Paradigms and Mirages which i use together and they sound about the same as my Bose Jewel Cubes with the sub. Yes Bose may not be the best, maybe a "Pro-sumer" brand, the best of the commercial equipment perhaps, but for the size of the jewel cubes, they sound amazing, ad when you live in NYC, space is a premium.
As for those systems found in cars. The acoustics of the car in question have a LOT to do with the sound. The Bose in the Caddy may not sound great (haven't heard it personally) but in the Yukon Denali it sounds very good. Very "car" sounding though, and by this I mean, slightly lacking in mid to top. In the RangeRover, the Harmon Kardon sounds ****e, very bad. Infinity, well, I swear by Infinity Subs. I had two IB120s in my car through the years and they performed awesomely (is that a word??) whereas I went through two Pioneers and an Alpine Sub in a week, even though they were rated to cope with my amp, they melted.
I guess I tend to pretty much go by the rule that the Japanese can't make speakers, everything else, yes, and very well too.
Oh, and yeah, check out Linn, they put the stereo in the new Aston Martin, which is a job and a half to get right considering the Aston has it's own amazing sound (the V8)
But like I said, it's all down to the install, the acoustics of the environment and the listeners personal taste.....