SSB4 3DS will crush Wii U version because it comes out a lot earlier, and has a bigger instal base.
Personally I don't see this as a good move by nintendo as it means that SSB4 probabally won't be a huge console mover. Why wait for SSB4 on Wii U when you could play it on 3DS five months sooner? Plus the 3DS is cheaper too.
Just look at USA preorders, ~6M Wii U preorders & ~17M 3DS preorders for SSB4.







