Hello All, I was wondering if these two attys performed the same,or if one outperforms the other. Right now I have a Riva 901 with 901 attys. I mainly vape 80/20 mix. So far I have one atty which rocks. Planing to order back-up attys. Should I also try 510's with a conversion? Thanks for all input. Happy Vapin'.7-2.