Not enough info to say
Really Depends on your own experience for one
have you the time & knowhow to train a youngster? Also how "well" broke the pre-broke one is
Some horses advertised as broke aren't very well trained or have holes in training,so you may have a re-training project...
Myself I have started all my horses,they will all pleasure ride/trail.Ones that I show I have used trainers to help finish & coach me. Some of using trainers too is that they have the facilities & are able to work them regularly
find it hard to get a horse trained/conditioned when you work & are at mercy of weather to find the time to get the riding/training time in