Rick or Daryl.
While I am quite capable of leading, I'm just as happy to let someone else deal with the stress as long as they don't go off the deep end.
Daryl is quite capable of leading, he just hasn't stepped up to do so.
Rick... Rick is a decent leader, but he may be getting close to going off the deep end.
My big gripe with Rick right now in the TWD shows is that they have been waiting too long to go scrounge for more ammo/firearms. Food, Ammo, Guns, and Medical Supplies should always be a top priority when the world has gone to hell.
It is also a shame that they have such a small group because they really need to be working on better securing the prison setting up strategically placed defensive positions, and ZA/Human traps and bottleneck points throughout, have at least 3 exit strategies and rendezvous points so the goof up at the farm doesn't happen again.
Rick needs to organize and he's not thinking ahead. That has constantly been his biggest flaw and it costs him group Cohesion. Glenn and Maggie (or Daryl) should be handling supply runs every other day at the very least.
As it stands now, they have absolutely no hope of holding that prison when the Governor shows up and after everything that has happened, they definitely should know better.