Such a hard question to answer in my opinion. I have a few favorite Jedi. In this series, master Plo Koon, Obi-Wan, Mace Windu, and Kit Firsto are my favs.
Plo Koon: Because he's an awesome lightsaber duelist, and a powerful force user. I really like his Kryptic Mage-like personality.
Obi-Wan: Because "He's wise as Master Yoda, and powerful as Master Windu." as Anakin would say. But he's a great leader, a great role model, and he kicks Grevious tail with his mad saber skills!
Mace Windu: He's one of the best saber suelists to ever grace the galaxy, he's second in command to Yoda, even though he used to be FIRST, and because he kicks major tail.
Finally, Kit Fisto: He's JAMAICAN! And because he's a master of Shii-Cho and he's great with the Force.
I'm sure there'll be more but yea... those are my favs.