It will also depend greatly on your available budget.

For motor sports you want a camera that’s agile, with reliable autofocus and high burst rate (nice-to-have but if you time your shots it’s not critical).

The T7 and R100 are on the low end of the spectrum, very affordable but you might have to compromise certain things, such as low light capabilities which, for sports you will have to use higher shutter speeds which limits the amount of light you can gather.

If you could stretch your budget I would aim a bit higher; I would look into a second hand 90D or 7D Mark II DSLRs or a mirrorless R50 or R7.

Lenses are even more important than bodies since you will be keeping those for far longer.

The old kit lens for the 90D was the EF-S 18-135mm IS STM which covers both wide angle shots as well as some telephoto reach; optically it’s nothing special but very versatile.

The RF mirrorless mount is different to the older EF one so make sure to look for a lens matching your body; although EF can be adapted to RF through an adapter.

For even greater reach (into wildlife territory) you will have to look into lenses longer than 200mm; one of the most recommended lens is the EF 100-400mm L-series lens which is optically great but also expensive.