You’ll get a different answer from everyone who posts a reply. Get a filter from a brand you like that fits your bike, and try different oils until you find one that agrees with your bike. Some people like Rotella. Some people say Rotella makes their bike run like crap, so they use Amsoil. Some say both give them trouble, so they go with the Honda stuff.
Just make sure, if you go synthetic, that it doesn’t have friction modifiers or say “Energy Conserving” anywhere on the bottle or else you’ll ruin your clutch.