Now
that is much more what a 2.5 yr old horse should look like, development-wise (Compared to previous ones of that general age you've posted about).
If you want to buy one of the horses you've posted about, I think this should for sure be the one as long as his temperament and soundness are all there.
The main thing I'd say against him is that his hindleg is pretty straight; not a good thing at all for a performance horse but just for a few hrs of trail riding it should not be a problem IME. (As long as he is currently sound and no signs of soreness suggestive of dropping pasterns -- but I've never seen that happen in a well-nourished 2-3 yr old, usually it is either a matter of malnutrition or a mature-or-older horse)
One could also wish for a bit larger knee and more bone below it, and possibly a hair shorter and stronger pasterns, but none of those things are IMO a concern for a recreational light-use horse. (He looks like he will be quite a chunky thing when he grows up, though, and it's too bad about the legs - not sure how well he'll be doing in, like, his teens)
He looks well developed, without being overly hefty (the way a lot of halter horses over here are); pretty well balanced; and a lot sturdier and readier to ride than your other prospects. If his feet are only at 10 weeks then he grows one heck of a lot of foot, I'd guess them to be more overdue than that; and it will take some care in correcting, and he should be given turnout and no work for a little while; but they look like they want to be fundamentally good feet so I would not be concerned about your ability to get them all fixed up in fairly short order.
I would not recommend him for hard work, but for what you want and especially if it is a choice between him or the pinto (or the other young QH you showed us) I would absolutely unhesitatingly say he is WORTH paying a bit more than the pinto for, and should probably make a perfectly reasonable riding horse for you
(Started lightly and *gradually*)
Mind that's all contingent on him being sensible and SOUND, but you're the only one who can tell about those things.
Good luck, have fun,
Pat