These are both size mediums.
Bellissimo left. 24/7 right. Bellissimos are noticeably wider through the center. 24/7's taller in front and back by at least 2 inches. I prefer the 24/7 fit more. The elastics seem to work better too. The plastic on the 24/7 is also thicker and doesn't sag or stretch out as easily as the Bambino.
Dry 24/7's are the same thickness or a tad thicker.
Bellissimo's wider in the crotch.
Bellissimo's may have more capacity, you can see that more coverage area for the sap over the dry 24/7, but I haven't tested them scientifically. I use boosters so it doesn't matter to me. The shape and fit of the 24/7 is better, in my humble opinion. I think they are better suited for day/work duty over the Bellisomos because they fit better and are far easier to move about in. Still using Bellisimos overnight sometimes, they have a different and interesting feel.
Tapes. Bellissimos are stickier, but once you stick em, that's it. I haven't had issues with the 24/7 tapes. They are noticably bigger and spread wider appart. I think this contributes to their improved fit. I use clear packing tape over my tapes no matter what diaper I use, to make a faux pull up out of them for during the day duty. So tapes have not been a big deal. I do notice that I get a defective tape on the Bellissimos from time to time but haven't found one in the 24/7's yet.