Mainly 3 different system. Road cleat, MTB cleat and Speedplay. For road, you have Shimano or LOOK, looks very similar but a different. Personally, I prefer Giro with MTB cleat. Easier to walk because the cleat is recessed into the sole. Road cleat stick out from the sole. Unless you want to walk like penguin, I prefer MTB cleat. People say Road cleat has better power transfer but you're not doing TDF. May save you 2 seconds out of 10km ride.
