As for myself, can't decide. I remember being a big fan of Bulbasaur and Charizard when I first got Pokemon Red. I remember training both of them to level 100 (including possible use of in-game rare candies). I named my Charizard DRAGONFANG. I didn't name Vanasaur. I remember being made fun of in middle school for liking Bulbasaur but for the longest time I really liked him. I can't remember if I very first choose Charmander or Bulbasaur but I think I did pick Charmander first because I planned on picking Bulbasaur but I didn't and choose Charmander and gave it his nickname. I don't normally do that so it must of happened when I was new to the game. I still can't decide who I am more sided with. Growing up I thought Bulbasaur and said grass type to my friends but I recently checked one of my older Pokemon games and found DRAGONFANG and my memory came back. I kept him throughout several following Pokemon games because he was my main Pokemon. I think I am probably leaning towards fire type but it is confusing remembering who I side with.
I thought I always chose grass types but looking back I definitely picked fire type in every generation first except 5th generation and maybe 1st generation (but already cleared up that confusion). I think that I might of picked grass type in the 5th generation first because I have been undiagnosed with schizophrenia for at least 3 years and when I got Pokemon Black I was in the midst of the chaos it caused. Maybe now that am being properly medicated that I can see clearly that I am sided with fire type. The strange thing is that I was at the hospital for a week for a number of things (mainly because my eye had been cut and was in agonizing pain) and I played Pokemon Black again all the way through with only Emboar. It is funny how things work sometimes.