In my opinion, the best starters in order are Mudkip/Chimchar, Treecko, Bulbasaur/Totodile/Turtwig, Squirtle/Piplup/Torchic/Charmander, Cyndaquil/Chikorita. Sadly one of my favorite Grass types just happens to be not-so-great in battle. Aromatherapy is a nice addition to Meganium's movepool, but its movepool still isn't too great. Cyndaquil suffers from the same problem. =\
As for which ones I like the most, they'd be (in order, obviously):
Chimchar <3
Bulbasaur
Totodile
Turtwig
Mudkip
Squirtle
Cyndaquil
Charmander
Chikorita
Piplup
Torchic
but only the top 3 are definite. I like all starters excluding Torchic so yeah... =P I'm not a big fan of Piplup, either, but Empoleon looks awesome so I don't dislike it either.