I'll say 64, though I'm curious to see how replaying it in 3D All-Stars may affect my perception of it. After that I'd say it goes to Odyssey, followed closely by 3D World. Galaxy is a great game as well, and 2 by extension. 3D Land was great for being a handheld entry and I enjoyed that quite a bit. Sunshine is my least favorite mainly because it felt a bit unpolished when I initially played it and at the time I felt like I was going through a phase where I didn't really enjoy much of Nintendo's output as much as I did during the N64 years. Like 64 I'm wondering how my feelings on Sunshine will change when I play it again in the upcoming collection and whether it will affect how I rank everything.

I was anxiously awaiting Uncharted 3 in 2011 and picked up 3D Land for the 3DS around the same time.  I was excited for Mario too, but I didn't expect it to keep me from playing Uncharted 3 for weeks (extensively anyway).  I remember one night booting up my PS3 with the intention of playing Uncharted as I was "finishing up" my play session with 3D Land.  Hours past as Uncharted remained on the title screen with me feverishly playing level after level of Mario.

I did like 3D World quite a bit more, but 3D Land is a gem as well.

Odyssey definitely comes close w/the grander scale & open-world aspect, but ultimately it doesn't quite beat the charm Mario 64 had and still has for me. Maybe it's partly nostalgia, but you also can't deny just how much fun the game still is, and the imaginative nature of the game universe/environments, even if the graphics haven't aged terribly well. Mario Sunshine didn't do much for me between the fairly repetitive tropical environment and weird paint-washing gimmick. It was my least favorite 3D Mario game.

Galaxy games were somewhat a return to form, but wasn't too keen on the constant bouncing from one tiny planet environment to the next or the overworld. Galaxy 2 ironed out these issues somewhat with the more straightforward map system and larger environments. 3D World was somewhat amusing with the simultaneous multiplayer but didn't do much for me otherwise. Felt like Nintendo was trying to bridge the gap between 2D and 3D Mario but it doesn't entirely work. Certainly better than 3D land on 3DS tho. 

So ultimately I'd rank them as such:

Mario 64>Mario Odyssey>>>>>>Galaxy 2>>>Galaxy 1>>>>Mario 3D World>Mario 3D Land>>>Sunshine

1. Galaxy - Pure gaming bliss. One of my all time favorites. Everything about it is so fantastic. I don't even know how to properly describe it. The way everything comes together is just amazing.

2. 64 - A classic. Unbelievably great game design at a time when gaming was just moving into 3D. I should properly replay this at some point. Something about the DS version did not work for me. Didn't control as well if I remember right. I would not be surprised if this moved down the list once I got to the more modern Mario games.

3. Sunshine - My favorite parts of the game were those without FLUDD. Mario controlled like a dream in those parts. With FLUDD, it was ok. Just not what I was looking for in a Mario platformer.

4. 3D Land - A good game. Something about it just doesn't do it for me, compared to the rest of these games. I think part of it is the weird way momentum/running works in this game. The setting is really strange too. So many levels are just a bunch of floating platforms in the middle of nowhere. That's just... lame. I need more creativity than that.

That's funny! Yeah, when I think about what makes comes really great, originality comes into play, and 3D Land was a breath of fresh air. We know what was coming with 3D world, and it was great, but it wasn't as unique as 3d land.

My favorite 3D Mario games are Super Mario Galaxy 1 and 2. Can't choose which one is better.

1. Mario 64

2. Mario sunshine.

3. Mario odyssey.

64, then Odyssey then 3D World. Sunshine was a miserable game to play. Not to mention massive letdown. Mario 64 and SMW world combined was the hype I was given. It was neither. It was a mess. Nothing was wrong with Galaxy. Just did nothing for me. Mario like many Nintendo IPs with me is hit and miss.

Super Mario Odyssey. it's my favorite mainly because I think it's the one that gives the biggest sense of adventure (which is something I really appreciate in games). In this game, exploring every nook and cranny of the worlds is really satisfying because there will always be something to find, and I also love the incredible variety that the Cappy transformations give to the gameplay and how there's so many creative challenges that make use of said transformations. While the game is not as tight as the more linear games, there's still many challenges that put your platforming skills to test.

Also, Galaxy 2 > Galaxy.

Galaxy, as it is one of the best games ever made. However I also have a very soft spot for sunshine so it is very close between the two