It all depends on how the individual horse trained and how experienced they are, that is the only way one of those two is 'better'. And those are two radically different breeds of horses. What is your goal? What are you wanting to do?
Do you have a mentor who can evaluate any horse you choose? Are you already taking riding lessons? What experience do you have with horses? Have you groomed, mucked stalls, taken care of tack, etc.?
Ride how? English or Western?
Pleasure/trail riding or something competitive?
If you want to compete, what venue are you wanting to compete in? Open rail classes? Breed rail classes? Jumping? Dressage? Endurance?