Well yeah but, no but. It's well documented that lots of UK Atlantic stuff is dubbed from disc and sounds pretty shoddy compared to the US counterparts. Same with other labes I guess: I recently picked up a UK Stateside demo of the Isley Brorthers "Love The One You're With" (great version by the way!) . Sounds very poor when played next to the T-Neck US issue. As for the issue around which labels have most detail - how about running times on UK issues?
Not that I'm taking sides however - I collect US, UK, euro and any other exotic foreign releases. Variations just make it more interesting for me