Our son has been at Christ College, Brecon (CCB) for a couple of years now, and we are very pleased with the school. It suits him very well.
To state the obvious - depends what you are looking for and what are your son's strengths. Both schools have excellent Estyn reports.
Had looked at Monmouth & CCB. We prepared our son very badly for entrance exams. He wasn't up to Monmouth but got into CCB. A lot of children sitting entrance for Monmouth came from Grange Preparatory - and had been very well prepared. CCB perhaps looked more at the potential of what was there - but obviously we are biased.
In his time at CCB, our son has been encouraged and supported in so many ways. He has developed academically, in drama, music and sport. Any aptitude/talent he has shown has been encouraged, nurtured and developed. Staff really seem to get to know the pupils. Facilities are very good and constantly being upgraded.
One thing we feel is a good indicator of what the school does- look at the end product. CCB seems to produce some genuinely nice, articulate and considerate kids who are confident without being arrogant, charming in a genuine way, and well equipped and balanced to cope with life.
But then, it's all down to what is best for your child.