There will always be people arguing about who's license is better - but once you've got 1000hrs it really doesn't matter.
Personally I went FAA - because its cheaper to get an FAA license, and because I wanted to work there. For the cost of getting a JAA CPL, you could get a FAA CPL, convert it to JAA and still have change. I'm frankly surprised anyone does all their training in the UK anymore.
In your situation you should look at where you want to work to see what kind of license you need. Of course, if you need to get a lot of hours to work there you'll probably want to consider instructing in the US - like everyone else!