Frankly I use both and there are maybe a few downsides to TC, one being that at least in some mods, the batteries are continually monitoring and sensing the coil (I think some DNA mods use a good enough conversion system that it doesn't much matter) but battery life may be a TAD shorter. Getting it set up with the right wire and settings can be a pain, but once you've done it a few times, you probably (usually) are going to find that easy enough. You are limited to TC wire.
I really had to work hard to think of those downsides, and yes, with small drop in MTL coils, good luck findig a TC capable one.
Otherwise I mostly think its great although I have enough setups, rotate them enough, and use other TC best practices that even in some of my drop in tanks, I don't worry excessivevly about temperature. I'm not going to let it STOP me from using some of my favorites, let me put it that way.
I do use TC if out and about and with fewer setups, because it is then, and mostly only then, that I'm going to hit my temperature "ceiling" honestly, so it's nice to have, but sort of not 100% necessary.
But I'd say the best way to find out how YOU like it is to try it. Some folks love it and use it all the time, some folks use it sometimes, and some just don't use it at all.
Anna