Boy dilemma

Soo I left my boyfriend of 2.5 years after being unhappy for a while, I miss him at times but have started going on dates with a new guy. This new guy is super sweet and makes me happy but he is a little small in the downstairs department. Like his penis isn't long and his balls are super small. Tbh sometimes I miss my ex's sex life and he still tries to give him another chance. I don't know if I should stick it out with this new guy or go back to my ex and hope it works out. This isn't about sex, but I figured it is a big part of a relationship so it would be important info to think about when considering my options...