For what you’re doing, pretty much any gas stove’ll do just fine. Canister top ones are less stable, so go for something with a tube between the burner and the gas canister – this sort of thing.
The all-in-one stoves – JetBoil and similar – are efficient and neat, but quite limiting if you want to cook anything that’s not dehydrated like eggs, bacon etc. Think of it as a glorified kettle and you won’t go far wrong.
Meths stoves are really slow and also hard to regulate heat with, whereas a gas stove is usually a lot more controllable if you need to simmer.
If you want something to boil water as fast as possible because you’re a self-supporting soloist, the MSR Reactor ones are amazing and I used one for just that, but only because I owned it already. Mostly it’s a snow-melting mountaineering stove.
But if it’s just for general cooking at races, cheap and basic gas stove from Decathlon or similar will be fine.