I’ve posted this elsewhere but I’ll reiterate it here - if size/bulk is a consideration for you when looking for a double case, the Gator is significantly deeper and chunkier than the Mono dual. I took a photo of the two cases side by size at BassDirect a couple of years ago to illustrate the difference. Gator on the left, Mono on the right.
Of course, if you aren’t worried about the extra bulk, the Gator is a great case with tons of protection for significantly less money than the Mono!