Galaxy TAB S7, all the way. I've used the Tab S5E, Ipad Pro 11", and Amazon kindle tablets. The Tab S7 is the best so far.

The iPad Pro has a bunch of issues thanks to few devs knowing how to handle the navigation pill. In MU this pill is displayed over the comics because the app incorrectly centers all images (this means black bars above and below each image, and that's on top of the pillarboxing inherent to the device when viewing comics). In all other comic apps other than Dark Horse all comics show a black bar below every image (as well as on the sides thanks to the shape of the screen), so aren't full screen on a fullscreen tablet, all thanks to how iOS handles navigation. It's ridiculous, and lazy devs like Marvel still haven't addressed this bug going on two years now.

This is why I was waiting anxiously for the Tab S7, since it's the first Android tablet with a 120Hz screen (smooth scrolling FTW). While the Plus model offers an IPS screen, the battery life isn't as good, and since it's 12", it's a bit too heavy, especially for one-handed use. This is why I opted for the Tab S7 (not the Plus) which is 11" and while the screen is LED, it still looks great without sucking up battery life. Page turns are smooth thanks to the high refresh rate (unlike the Tab S5e and its 60Hz screen), so for me is the ideal tablet for comic book reading. You also get a memory card reader, so can hold up to 1TB of comics if you have a micro SD card. So for things like Comixology, or simply sideloading your own comics for apps like CDisplayEX, it's unbeatable, at least as far as the competition (iOS) is concerned.

One thing to consider is that even though MU offers high-def art finally, it's still low-res compared to Comixology. So if you go high-end for your tablet like an iPad Pro or Tab S7, those high-def screens will make the lower-res of the MU comics more noticeable, especially when zooming in.

Honestly, digital comics are still in a bad state, and since all of these apps target so many different devices, most run like crap. Few offer any semblance of customization when it comes to reading, and even if you pirate, apps like CDisplayEX have their own issues, like popping up the nav and notification bar over the image of a comic when rotating the device. If you have a low-threshold for bugs and the like, stay clear my man, it's a deep well filled with lazy development, and a killer device only serves to make this even more clear. Truth is almost all of the apps suck, and you will be stuck with them if you choose to invest in any of them since they never improve. A good device won't fix the primary issue, these companies are lazy and operate as if they've never used a proper comic reader in their lives. I was using more advanced comic readers on PC twenty years ago.

But to answer your question, yes, comics can display fullscreen on tablets without the need to advance one panel at a time.

*edit, just in case anyone cares, Amazon has a killer deal today on the TabS7. You can grab the 256Gb model for $150 off, which is the starting model with 8GB RAM. https://www.amazon.com/dp/B08FBPLZDV