Daxter is a very very very better than TLF. It features Daxter in the 2 year gap when Jak was captured but I'm guessing you already know that. The story was better. It showed Daxter could step up to main character in a game. The gameplay is really fun as well.
Kingdom Hearts FTW!
Moveset ideas:Ty the Tasmanian Tiger-http://community.us.playstation.com/t5/PlayStation-All-Stars-Battle/Ty-the-Tasmanian-Tiger-moveset/m-p/39916477
Each game got better and better in my opinion. I've never played Jak X or the other spin-offs so I can't speak for those games.
You're not stupid it's the stupid things you do.
My personal favorite, would have to be Jak & Daxter: The Precursor Legacy. I liked the standard platformer feel, and the simplicity of the combat. Granted, I love Jak II and 3 as much as the next person. Definitely my favorite games to Platinum .
In my opinion it'd have to be Jak 3, simply becuase it combined the more platformy feel of the original Jak and Daxter yet still carried over the ragged-feel of Jak 2, but still mad respect Precursor Legacy.
In my opinion, Jak 1 was the best because it was the most polished. Whenever a new gameplay mechanic was added in the sequels, it usually needed improvement.
However, Jak II & 3 deserve credit for showing that Naughty Dog was becoming better at storytelling.