The second horse doesn't look too much better IMO, and again likely show bred. He is built downhill, maybe long backed (the picture is a bit angled so not sure), posty in the hind end, looks like he might be cow hocked but you'd need a picture from the rear to tell. His legs are light boned... overall I don't like him, I actually find him quite funny looking
His shoulder and colouring is nice, but that about all I like from those pictures. You'd need full body pics to get a better critique, as well as one on his front legs.
In that case, especially if you're looking for a horse to cross over to eventing as well, I would really suggest you don't look at pleasure bred horses like the ones you've posted. They are bred to have very flat gaits with virtually no movement in the knees or hocks. Also, their necks are set so low to get that low headset that it's hard for them to get that front end "picked up". That will make it very difficult or even impossible for them to pick up their legs enough to safely navigate rough terrain or jumps.
If it was me, I would look for horses that actually had bloodlines and/or training for eventing; maybe a TB, an appendix, or warmblood cross. A decent eventing horse can easily do a competitive trail course, but a trail horse may not be able to transition to eventing.
As far as build goes, something that looked more like any one of these would suit your purposes better (these aren't sale horses, just random horses from a google search). Sure, they still have their faults, but generally speaking, they are better suited to eventing and CT.
Notice the differences between these horses and the ones you posted. These have shorter backs, stronger hindquarters, better legs, their necks tie in higher, etc.