SMG is well deserved to sell the most copies of 3D Mario.. a great game!

As for 3D World, sales are disappointing, but it's to be expected with Wii U hardware sales

SM3DW has higher sales for the moment than SSBU.

Why do other examples matter? Your reasoning says that Galaxy sold more than 3DW because it's better. You compare 3DW with sales of MK8 and SSB4 (on two different platforms) to somehow prove more people were willing to buy Galaxy over 3DWorld. Yet MKWii outsold Galaxy 3:1.

You also ignored SMG2 which "only" sold around 7 million copies. And lastly, 3DWorld isn't done selling yet, SMG2 is.

MKWii outselling 3:1 to SMG didn't matter as the game sold enough good for a 3DMario. 12.5M and move consoles. 3DWorld hasn't sold enough for a 3DMario game and didn't move consoles. Now, it's common sense that all those examples posted before are more noteworthy for this discussion as already was proved to you that 3DMario's can sell on par with Smash and MK's games, which was an excuse for the subpar performance of 3Dworld.

Now, SMG DLC selling 7M was never mentioned as I don't care about that game. In fact, it sold less than the first one because the game was not as good as the first one. You have already proved with this argument why 3Dworld didn't move consoles or sold better.

SSBU didn't move consoles either.

SMG2 has a 97% score on metacritic and is loved by many. The fact that you don't care for it quite frankly doesn't matter.

SM3DW has an attach rate of almost 50% yet it isn't selling good enough?

Out of all the 3D mario games, the new SM3DW, is the only one to kinda dissapoint me when I played it.
I dont know, I think I just expected too much based on previous games and ads/videos from the new SM3DW.

Its not a bad game, but its not a great game.
When you buy a 3D mario game, you expect greatness.
With nintendo a good mario game can be what makes you buy the consol outright (same with zelda).

Personally I think DK:TF > SM3DW.

Mario has always had a nice pair of legs XD

12.5M has an attach rate of only 12.37%

3DWorld is 42%

Guess who sold more.

3DW is not to blame for the Wii U's shitty sales.

Look at the sales of 2D Mario on the Wii. Is it that hard to believe it would be possible for 3DW to outsell Galaxy if it was on the Wii? It's a mix between 2D and 3D Mario. The Wii's audience obviously prefered 2D Mario over 3D Mario.

UPDATED

Almost an exact list of best to worst but I think Mario 64 was the best one, followed by galaxy.  3D World was a pretty horrible mario game tbh