Worth using TM on my Entei?

I prefer Flamethrower > Overheat on Charizard and Flareon, me personally, I wouldn't

As you know, overheat has a higher dps, but I prefer the nearly half cooldown (2.2s v 4s) for dodging purposes and as well there are scenarios where a defender/boss gets KOd or Entei gets KOd before it can fully charge and fire off an overheat, another reason why I prefer flamethrower

Don't worth the risk of getting FB.

I dont think its worth the risk, and you already like FT. Unless you have a ton of TMs, then fuck it.

http://www.pogomoves.com/check.php?lang=en&pkmn=Entei&basic=Fire+Spin&charge=Flamethrower

About 90% of the damage of Fs/O.

I think I might go for Fire Fang/Flamethrower for better dodging, even though it is the weakest moveset. I like my legacy Ff/Ft Arcanine better than my Fs/Ft Flareon.