So far I've just been overly pleased with Smash on the switch. I had no intention of buying it on the lead up. I'd bought the previous game on both 3DS and Wii U and really, they barely got any play time compared to the Wii or Gamecube editions. But, I folded, I bought, I've played and...it's...good! Really good. Everything you could want in a Smash title. The portability is actually good. The use as a party tournament game is great. Spirits mode is excellent.
Online: No comment as I've yet to try, but as an offline game so far, well...exvcellent.