For roasting things, I prefer the kind that you leave in the meat, with a wire snaking out the door to an electronic unit. You set the temp you want, and it beeps stridently at you when the correct temp is achieved.
Saves a lot of the “open door, let out heat while you squint through the blast to read an LCD display” guesswork. The only time you need to actually open the door is to baste.
(But this kind works less-well for stuff on stove.)