That greatly depends. If you have the experience, then both sound like good choices. However, you also need to take into consideration their conformation, any potential future issues (due to conformation, being at the track wear and tear, etc etc.) and in turn - will the horse be suitable for the level you plan to ride/compete at.
If you just want an all around low level horse, again provided there's nothing glaringly wrong and you've got the experience, then both could be good candidates. If you are wanting to focus on one discipline and move up the levels, then you need to consider things more heavily regarding conformation, way of going, what's their brain like, etc etc.
What does your trainer think regarding these two horses?