Well thast your choice but not everyone choice. I dont have access to wifi myself too. And while Froakie might be popular, Squirtle is too.
I never liked Venusaur (Ivysaur is adorable however) so not gonna pick him. You see its all a matter of preference more then typing, with them offering one Starter from 1st generation.
As for water starters, water is teh best element of of teh three, with less weakness then the other so yeah, overral, its the strongest. There never was a generation when a Grass starter was said to teh the strongest out of teh 3 starters (and that a shame).