I hate to do this because I love SMB3, and I hate the fake SMB3 vs SMW shitposting from people who don't even like Super Mario games, but let's see.
The variety in SMB3 is great, but when it comes to it, the Super Mario formula is still the same: Athletic/ground levels, underground levels, sky and/or treetop levels, underwater levels, and castle levels.
This is the formula in the first Super Mario game and is still more or less the same in 3 and World.
3 has the egyptian world, which emphasize lots of breakable blocks everywhere and pyramid-like structures, the giant world (of which only 2 or so actually have giant enemies?), the ice levels, and I guess the pipe levels? Yes, 3 is very creative overall, but let's see World:
No egyptian levels, but does have levels that emphasize blocks, in fact, one of the Star World level is 90% blocks.
Giants? It might have even more giant enemies than 3 does, or thereabouts: Big Boos, Dino Rhinos, Mega Mole, Banzai Bill, Hothead. Likewise it also has small version of regular enemies (lil sparky, thwimp).
Ice? Sure, not much ice in a mostly tropical region like Dinosaur Land, but it does have 2 ice levels (one of which is one of the best in the game, imo), and a few ice sub-sections in some levels.
Pipes? It does have levels that also emphasize a lot of pipes, it also includes pipes that change their lenght as you step on them.
World also has Ghost Houses, a new type of level that focuses on puzzle-solving (something 3 included in fortresses, in World's case, Fortresses are kept for heavy action only, no puzzle), and Forest levels, a new kind of setting for Mario games (despite being a fairly generic setting, no prior Mario game really had it).
Not to mention Star World and Special World, which are secret worlds-within-secret worlds.
Both games are extremely creative, SMW, as the name suggest, is just more cohesive, while 3 has separate, smaller worlds that aren't interconnected with each other.

>Jurassic Park was released on November 20, 1990
>Super Mario World, set in Dinosaur Land, was released on November 21, 1990 (which due to time zone differences, would be November 20 in the west)

I don't think platformers got any better than Super Mario World honestly.
Games like Ninja Gaiden or Mega Man X added some interesting stuff like wall jumping or dashing, but I still think the sheer volume of physics possibilities in SMW's controls is just the peak of the genre and all devs can do from here is do things differently but not surpass it.
I think the only other game that I would consider more complex than SMW (strictly talking about controls/physics) is Mischief Makers with the jets and the amount of speed/trajectory variables, and of course also has the grabbing and throwing aspect (that can and does affect the platforming), but despite MM being amazing and honestly with an endless skill ceiling, I still think of SMW as the king.
There's a reason it's SMW that's the most popular romhack platformer game ever.
I've played more modern indie games that kind of embarace the kaizo culture, such as I wanna be the guy, vvvvv, meat boy, dustforce, they all are clear followers of old school platformers but I wouldn't necessarily say they are better or more refined than the old games, they just focus more on certain aspects.