190KV or 120KV Maytech Motor?

My question is about the Maytech 65162 engine:

Would you rather use the 190KV or the 120KV engine
respectively what are the advantages and disadvantages of the two engines.
I want to get as close as possible to the 50 kmh with my eFoil.

Also does this Battery works with that engine

Or are there many better ones ??