With FDM, you can easily print PLA, PETG, and TPU. ABS and Nylon are much stronger materials, but they are harder to print. It requires the printer to be in a more controlled environment, like inside an enclosure, and they require higher nozzle and bed temps to print them. And ABS isn't good to breath the fumes from. But I do know a guy that prints Nylon on a regular Ender 3 without an enclosure. The newer Ender series printers make this easier with their 24v power supply.
PLA works for certain RC parts. For 24th scale stuff, it would be just fine for crawlers. It mostly depends on the orientation you print the parts in, meaning printing a part laying flat on the bed, vs standing up on an edge will yield different results when it pertains to strength. PETG would be a really good material to print 24th scale stuff out of.
SLA or resin printers are great for getting fine detail. Printing small wheels with the little lug details for example turn out much better on an SLA printer. But you have the resin to deal with. It's messy, sticky, and you have to clean the parts afterwards in either alcohol or mineral spirits, all while not getting it on your skin. It builds up in your body over time, and it can cause a myriad of health problems if improperly handled. Then you have to have a UV light to final cure the resin, and cure the waste so it can be disposed of safely. It is very bad for the environment if uncured.
I suggest you start out with an FDM printer. Particularly the Ender 3 V2. It is a great printer for the money. You won't find a better one in that price range. I need to grab one myself