Ryan Gracie cos he's the most well rounded & exciting mma Gracie I've seen.
Although I do like Renzo as well. Excellet fighter & seems like a genuinely decent guy. I can't remember ever seeing him not smiling when he's not fighting.
for bjj wizardry - Rickson above anyone else living, he was the sheriff of the family back in the day.....
for mma - Renzo cos he will take a fight with anyone, and if he loses there no excuses.