SMB3 was a revolution. SMW was an evolution.
I personally prefer SMB3 because the controls feel tighter, where SMW sometimes feels “floaty”. But it’s a subtle difference. SMW gives you way more content, but not all of it is as good or as well-designed as the levels from SMB3 (though again, the difference is subtle.)
They are both all-time top games, as is Mario 64.
I would much rather get the Bluetooth TOS communicator replica that came out a little earlier, as a present for my dad. I wish they made more of that, instead.