The small canister-top stoves are mostly pretty much the same.
You may like to consider burner size and pot supports against your pan size - a bigger burner spreads the heat out more, reducing the tendency for things to burn on, but used with a small pan you lose heat round the side.
Some have piezo ignition, which is nice when it's working, but reportedly has a tendency to break.
Ones that are different from normal that you may like to think about are...
Optimus Crux - the burner folds flat enough to allow it to fit in the recess in the base of a 220g canister, in a pan. May be slightly wobbly as a result.
MSR Superfly & Primus Duo stoves - allow the use of blue Camping Gaz canisters as well as regular threaded ones.
I prefer the remote canister/hose versions like
this Alpkit Koro, which allows the canister to be turned over to combat the loss of power you get at the end of the canister or in cold weather. The preheat loop (brass-coloured tube next to the burner) is necessary to allow this - not all hose-connected stoves have it.
Threaded canisters are pretty much all interchangeable. The only exception is that Coleman canisters can occasionally not work with non-Coleman stoves - the valve is set fractionally deeper.
The blue Camping Gaz canisters don't have screw threads on the valve, and can't be used with stoves that attach using the threads. These are much more common than threaded canisters on the near continent (i.e. many/most supermarkets, rather than just outdoor shops).
If using a canister-top stove, it's useful to get some feet for the canister to assist with stability. I prefer the
MSR version