Onehunga
You should not be expecting to fly to the USA in your first job!
There is a serious point here. My employers have found significant extra work is needed at the CPL stage for students who have done PPL or hour building in the USA. If this means extra hours they cost quite a lot with a CPL instructor. I had great experiences in North Carolina and Florida, but I also had over 100 hours of formal training in the UK, and I know which brought me through my CPL.
I don't know the effect on employment prospects, but if you were a UK regional airline and had two equal candidates, one of whom had most hours flown in the UK, one most hours flown in the US which would you choose?