Mod Cooperative

Hi! Sorry to bother you guys but I was thinking of trying to make my first RPG. I have made an account on Livejournal for it but I'm not too sure whether I should be using Insanejournal instead. Insanejournal appears to be much more rpg orientated and would it, therefore, ultimately be better for the game if I switched?

Also, is it inappropriate for me to put ads for a Livejournal rpg in Insanejournal and vice versa?

Any opinions or advice would be greatly appreciated.