Type A is best, Type be is okay., Type C is worst. You should always have at least a A or B, never a C. A means is possible to play with everyone and B is kinda restrictive who you play with but not as bad as C, is still just as playable as A. As long as you don't get C you should be okay.
Since i use wireless i have a B and always will since i can't use wired connections with my game consoles. (they aren't in range of the router nor does the router have enough ports for all of them.) All my consoles usually have a B/Yellow/2 type nat which i guess the label is different for each console/game you play. In Street fighter 3 3rd strike online edition for playstation 3 is yellow, to be nat 2 in the home settings. Is possible that even wired connections can get nat 2/b type connections, and that is basically if your home network is blocking required ports to access the online services for the system. IN this case having a UPNP on the router or port forwarding to help with it, as alternative to taking down firewall is a common practice. Weather you have A or b on nintendo switch is not a big deal