The Vita version is the weakest if you try to compare an experience crafted to the Vita to an experience crafted for the PS3. It's actually an amazing little title though otherwise. Admittedly, I haven't beaten it 50 billion times like I did with Uncharted 2, but it still stands as the only and best mobile, true Uncharted experience that we'll probably ever get.
As someone who grew up poor though, I know that struggle. I only ended up getting to experience Uncharted 2 because of a seriously lucky choice on the rare occurrence that I actually had a chance to get a new game. I didn't end up playing Uncharted and Uncharted 3 until I started going to college. Now that I'm 21 and have my own budget though (which is both frightening and fantastic), I'm happy that I'll be able to grab the first three Uncharted games, set up for their best appearance yet on the improved PS4 hardware.
Also, Uncharted 4 is going to be incredible. I can tell now. That is such a day one purchase for me, it's insane considering how careful I usually am to only buy games I've researched pretty thoroughly post release.