What is better ETF or Mutual Funds for the long term - Also what is better Fidelity / Charles Schwabb / or Vanguard?

Hello,

Was wondering if the masterful people on reddit can assist me in direction towards a better long term decision.

Currently I put in about 30,000 usd in a Primerica Mutual Fund and want to know if it would be better to transfer over to another account? I already paid the hefty 4% fee which they got to take their 1200 usd from the original amount - not sure i'm fully trusting in Primerica since they do come off as an MLM but my cousin who I trust led me to a Broker who is still active that he used to work/live with and said he's a trustworthy guy.