I agree with first & last 2 posters. RHCP are much more diverse than BJ, and while AK can't beat JBJ (on a good day) live, Frusciante blows Sambora away live...
About studio-albums

Mojo plan/Freaky style
Blood sugar sex magik (forget about OHM)
Californication
By the way
Stadium Arcadium

NJ/ Slippery
Keep the faith
These days
Crush / Bounce
Have a nice day

The first lot are much more diverse than the latter lot.. so IMO I agree here
Talking term of favourites IMO, Stadium Arcadium is anything better than BJ released since 2000. They are in their 40-ies also, had a thougher life than BJ but proved that they still can do it...
If Californication would've been properly mixed & mastered and therefore had a proper quality it would've been right there with TD (all imo)..