Currently Online 
I think Brawl had bigger hype (the Smash Dojo, the 6+year wait from Melee, the delays) but the Switch has a more core audience. Not saying only core gamers play Smash, but they are way more likely to than an average consumer. The Switch has sold just about as much as the Wii, if not more in the equivalent time period. So yeah, I think so.
Lifetime Sales Predictions
Switch: 151 million (was 73, then 96, then 113 million, then 125 million, then 144 million)
PS5: 115 million (was 105 million) Xbox Series S/X: 57 million (was 60 million, then 67 million)
PS4: 120 mil (was 100 then 130 million, then 122 million) Xbox One: 51 mil (was 50 then 55 mil)
3DS: 75.5 mil (was 73, then 77 million)
"Let go your earthly tether, enter the void, empty and become wind." - Guru Laghima
