You have options. Doesn't even have to be Apple. Theoretically lower power should work, although it may not be ideal if it's providing less power than needed to operate and has to tap into the battery.
Belkin and Anker have some pretty good high-power adapters. They're using gallium nitride converter circuits, which run a lot cooler than silicon. I heard that Apple only has that in some limited applications so far, like the 140W power adapter for the most powerful MacBook Pros.
https://www.belkin.com/us/chargers/c/wall/
https://www.anker.com/ganprime?ref=naviMenu