I like the Honeywell HeatBud. It's small but is able to hold both my 2.3x2.3 and my new 4x4 tent at 75-80 degrees. I have one in each with an inkbird controller.
There is a position I and II on the switch. Position I is 125w and II is the full 250w.
It's enough power for the space while still being small and not too much draw for a power strip with lights, humidifier, fan, exhaust/filter, etc.