I voted Pokémon because I'm currently doing one too. You should start with Kanto but it's your choice.
I remember, I was your first comment! Didn't you start yours in Kanto? I'd hate for all the Pokemon stories to start tale same way...
I did say it was your choice. If you want to start in Kanto, go for it. If you want to start in Alola then go for it.
I'm currently working on a Kingdom Hearts fanfic
I've never played those