Well I only recently stopped instructing there and would recommend the school to you without reservation as long as you can handle a year away from home. Those with significant partners find it a slight issue being 1100 miles from home.
Otherwise its excellent. THey are throwing money at the facilities and they are on of the few schools where aircraft availability is never a problem. Pass rates are good and its cheaper than comparable courses when you factor EVERYTHING in like food, accom.
Which school you went to makes little difference on your CV - however BAe is as good as OATS anyday to the interviewing Chief Pilot. They train Aer Lingus, Airtours and British Airways cadets and have been long established at Prestwick.
If you can go and take a look it would help you enormously. A flight from London Stansted to Malaga can be had for as little as £55 and all you'll need at the other end is a £10 rail fare or one days Hertz car hire...
Good luck,
WWW