The only real concern with the X-T3 is how much “used” it is, unless you have managed to locate a new one (these are in short supply these days).
You have @Greybeard speaking up for the X-S line, so I will speak up for the X-T line. 😇
They are fun! You have all those easy to use dials (no need to mess around with that SPAM dial and menus stuff).
The best camera is the one you take with you and use.
If you can, try these in your local shop or rent them for a few days and see which one suits you. Processing software for stills and video is easy to find, so test the hardware.