There are far too many to pick just one, IMO. I think it also depends on the forums one inhabits most. I post from work, 99% of the time, and therefore need to keep it light, and more importantly, short. So I mostly hang out in MPSIMS.
I’m just glad to be able to hold my own in this crowd!
I would have picked Drain Bead, but how can someone who is supposed to be smart be with the guy she chose? 
Yer pal,
Satan - Commissioner, The Teeming Minions
*TIME ELAPSED SINCE I QUIT SMOKING:
Five months, two weeks, four days, 3 hours, 3 minutes and 10 seconds.
6845 cigarettes not smoked, saving $855.64.
Extra time with Drain Bead: 3 weeks, 2 days, 18 hours, 25 minutes.
*“I’m a big Genesis fan.”-David B. (Amen, brother!)
Lola underestimates how intelligent she is most of the time and since I know her really well I have to give her my vote.
Dopers in general seem to be smarter than your average bear so whomever is considered the smartest must be a very bright cookie indeed.