I had a varible speed Dremel. Hated it.
My Dremel was nearly worthless due to the high rpm required and lack of torque. Easy to burn resin and melt plastic. Very happy to be rid of it.
Currently, I have a MiniCraft UK rotary tool set up and it rocks. The variable speed transformer, hand drill, lathe with the large drill and the sander all work very well. Variable speed and 12 volt DC torque allow outstanding control. It cuts, grinds, drills etc very well at low rpm. Its been bullet-proof for 25 years.
MiniCraft UK is everything good my Dremel wasn’t. After experience, with a good MiniCraft set up one can drop the rpm low enough to shave mold seams off of parts with a good dental bit and not leave scars or marring.
It’s proved invaluable for armor modeling. Wheels have mold seams? Use a cut wheel wheel attachment to clamp the wheel and sand paper to clean up the wheel. Its been used on every model tank I built since the mid 1990’'s. Distributor in the USA seem rare these days so ordering from the UK might be necessary.
The deluxe MiniCraft variable speed Transformer and hand drill.
Lathe & large drill
Sander/grinder - this is used the least of the three.
Also worthwhile for nasty seam sanding & heavy duty clean up the MicroLux mini sander from MicroMark. Has various attachments with sanding pads. Its powerful and works very well. Its not a finesse tool for delicate work in my experience. There’s another version with additional attachments but I forgot the brand name.
I’m sure there are other excellent rotary tools available too.