FYI, EPST is partly owned by those running CTC.
Now, there's the catch. Because of this you'll be 'part of' CTC/ATP before starting your initial course and with the guaratee to refund you when no job is found after an X amount of time.....
Oxford being typical British, don't defend it or do it because of those reasons. EPST has placed already numerous cadets at various airlines, yes BA included, and Oxford only helps you to the interview by doing what? What happens after that interview? "Sorry, we've given you the interview..."
EPST has used Cabair for the better part of its recent years, but compared to BAE they became too expensive, and since they do not want to reduce their profits only so that another British company exists... You'll get the point, same level of education, less costs...
I'd know what I'd choose if I were to be in yor shoes at this stage, EPST. In fact this is what I have done and am now happily employed by a growing low-cost carrier in the UK.
Good luck, and a quick word of advise, British doesn't always mean better.