If you can afford Oxford/ FTE, go for them no question!! The key thing to look at is who has managed to gain the most employment for their students in the UK and OAT and FTE would win by miles in that context. That said, you pay well in excess of £70k for the privilege which is out of reach for a great deal of people.
I only did my PPL and NR at OFT about a year ago now and I must say I was fairly impressed, although transition from US airspace back to the UK is bloody difficult of you only know US procedures and have only used US RT. I guess that is fairly dependent on the individual though. I found that I saved probably close to £2k on my PPL having done it in the states (some of that offset by having 2 1/2 hrs dual conversion when I returned to the UK) but still a good deal. The accommodation was fine (in fact I was pretty chuffed with it - we had a pool and tennis court which was great after a long day at the airport and the rooms were a good size and well furnished. My instructor was pretty good - she was perhaps letting me get away with errors she should have jumped on but other than that, she got me through fine. I flew the 152 and had no real problems there - the warriors at the time were very busy but I managed to get booked in everyday at least once on the cessna. They were ... shall we say rickety, but had plenty of character! I could have paid another couple of grand and flown in the lovely 172 S models but I was on a budget. The ground school teaching in all honesty was a bit of a shambles - not that useful, but the confuser and my CBT stuff got me through all the exams. So all in all, I left pretty happy but I think I would prefer to train in the UK if I had the money.
However, I do know someone who is out there at the moment doing a bit of training who trained with me last year and he says it has definitely gone downhill a bit - a few too many aircraft going tech and not enough instructors. This is only secondary source though so don't take it as is necessarily - just make sure you do lots of research! With OFT, general advice is budget to spend at least 10-15% more than quoted and allow more time that stated. If you allow for this, you shoudn't find yourself under too much pressure.
I am getting through the Single Engine phase of my commercial training now with an excellent institution who operate as closely to an airline operation as they can and I much prefer it this way - there is pressure to achieve certain things in a certain amount of air time with little room to play with but my flying has improved already quite a bit and I find myself preparing a lot more on the ground before going up. I think you would see something closer to this at OAT/ FTE and that might be preferential to you. It's all individual at the end of the day - the money you save could allow you to get a type rating and be more employable that way.