[Q] Any advantage to US generic ftf over UK generic? topic

I am replacing a D6603 from Handtec (UK generic) with a D6603 purchased at a U.S. Sony store (either US generic or global -- not sure which). I use the phone on AT&T almost exclusively in the US.

I noticed that the UK version is on a later build, and since Sony is more popular in the UK, I imagine that would always be the case. Is there any drawback to just flashing the UK version so that I can get quicker updates? Is there a different version I should flash instead? And for clarification -- flashing a different ftf will NOT erase my drm keys, right?

Thanks!