If you value getting to your destination in a timely manner, don’t fly B6. Mint is basically lipstick on a pig. B6 is a LCC and I would not be loyal or give my premium business to an LCC. Hard stop.
Mint was great years ago when it first was introduced. Unfortunately it’s no longer the case.
No lounges, lousy operations and reliability, I can go on and on.
AA/DL/UA all have their shortcomings, but they are always going to be more reliable and better in IRROPS