Noise reduction is better. And, if you wear them just for the ANR with no music playing, they’re quieter then as well. Instead of 17 discrete levels of volume, the digital crown gives you more continuous volume control. The same control you’d get using the touch volume controls on the Apple Music interface. Just now noticed as I flip back and forth between the two, the same loudness on both sounds better and more balanced on the AirPods Max. Not an audiophile, it just sounds more comfortable to listen to.
Speaking of flipping back and forth, I put on one pair, then the other back and forth and the audio always automatically comes out of the one I’m using

I’ve also noticed how much the Studio’s touch your ear, which wasn’t really a problem for me. However, now that I have the AirPods Max standing OFF from the ear, it’s certainly a preference now. Instead of a big broad mashing of the entire ear area, the contact is
around the ear. As for weight, they’re heavier, but I’ve worn these for hours with no problem, your mileage may vary. Also, I feel the band of the Studio’s more than the mesh of the AirPods Max.
The charging port is on the right side, still, so if you have to use them while charging, that’s familiar. The microphone is in the earcups, not the cable, though, so if you’re used to holding that cable dingly bit to your mouth to ensure your clothes aren’t affecting the mic, there’s no more of that.

Your controls are ALL on the right, so that’s another thing to get used to. Volume/Siri/skipping forward and backward via the crown is easy to get used to, though.
When you use them for wired audio, it’s a little different. So, you know the Studio’s cable dangly controls volume when you’re wired (you see the volume interface change). But, the click controls on the left earcup are disabled. With the AirPods Max, when wired, there’s two separate levels of volume control. The iOS interface controls 0 to 100% and the digital crown controls what 100% is (with a little audible “pop” when you get to the max. And, just like you should removed the cable when you’re done using them with the Beats Studio, you should do the same with the AirPods Max, too.
The last thing I can think of checking right now is the cable dangly mic, MUCH improved. Much less static, much higher quality, and really good vocal isolation. There’s Christmas music playing in the next room that the Beats Studio mic picks up (along with a large amount of hiss), but the AirPods Max gives you just your voice. I can see why calls would be much improved with these.