I completely understand you - the choice can really be overwhelming, especially when you want convenience for yourself and comfort for your cat. Personally, I faced the same problem a few months ago and settled on toilets with high sides and a built-in odor filter. I really liked that such models really help keep the space clean, and the carbon filter almost completely eliminates unpleasant odors, which is a real salvation for an apartment. At first, my cat sniffed the new tray with interest, but got used to it in just a couple of days - the main thing is that the place is familiar and not too bulky. For everyday use, I consider such options optimal: they are compact, easy to clean and at the same time convenient for the pet. I also noticed that the double bottom really saves time on cleaning, but for my apartment, the filter turned out to be a more practical solution. If you want, I can send you some proven models that really work and cats like, like those presented at https://www.petbayaus.com.au/collections/cat-litter-trays - the choice there is wide and high-quality. I can safely say that after changing the tray, cleaning has become much easier, and the cat is clearly happy!