SO epicmafia and town of salem are both games where you need to figure out who is what and kill to make sure your faction wins. Ive played many games of both and im gonna compare what I believe the three most important aspects are and which one I believe is better.

Roles: Epicmafia has far more roles than town of salem has. Many of them tend to overlap or feel the same but overall it has more variety than town of salem in this regard.

Playstyle: Town of salem wins this because generally speaking, it goes a lot smoother. The days move on regardless of whether or not the players were ready. In mafia, you have to wait until everyone has selected a thing which causes the day to drag on and the activites happen very slowly.

Community: By far community is the most important part and in this regard, town of salem is the winner. The community for epicmafia is much smaller and youre bound to play with the same people several times and with a lack of anonymity during the game (anonimity in mafia is optional and rarely chosen) it can lead to grudges which messes up the game in one way or the other. Ultimately salem has a much better community.

Overall, Salem is more fun to play despite the lack of roles to be.