Did he WANT to ride either of these horses? My DH thinks he wants to ride, to spend time with me doing what I live for, but the reality is he does not want to ride. He rode when he was in jr high and high school, had skill enough to show with his family, but that was 30 years ago!
Occasionally, he wants to be a passenger on a horse, but if there is ANY challenge(with the horse, the trail, the weather, etc), he will go home. It doesn't take much, trust me. Babysitting is not fun for me, so I try not to take him.
Your fiancé is younger, and you may not have these challenges, but perhaps you should buy a horse for YOU, and get him lessons to test his commitment before you get a horse for him.
Just my experience.....