Albion ONE doesn't include the full legacy library - only certain patches. I also prefer the old legacy version.
The ONE samples sound a bit too tight end overly processed for my taste, and some of the stuff sounds oddly synthetic. I find the strings much, much better in the old version - lively, colorful, quirky, raw, soulful. I actually think they're some of the most beautiful and interesting string samples ever recorded. The new strings sound odd ... like a gigantic cello section ran through some synth. No magic left. The only patch I like to use is the thunderous low shorts in octaves.
The brass is really just weird. Doesn't sound right at all, at least to my ears. The old woodwinds are softer and sweeter. I do however like the "arranged shorts" patch in the new Albion, it's very useful. But overall the woodwinds here sound too reedy - it gets nasal and biting real quick.
The percussion actually is better in Albion ONE. It's cleaned up and more comprehensive. It's partly the same material, but also comes with some great new stuff as well.