I have the 12gal with the removable motor for a handheld blower.
link A few times a year they put it on sale for $50 or less. Got mine F-day sale a few years ago for $38.
This one doesn't tip over. Maybe it's happened one time to me. If I pull on the hose, it rolls to me. Small ones don't do that, even smaller ones on wheels. This makes it worth the floor space it takes. The removable blower is great for cleanup, I originally thought it was just a gimmick, now I'm so used to it I have thought about buying a replacement for it before it dies and just store it. Another nice thing is this one has the drain plug so no carrying it wet necessary. I try to use it for dry cleanup in the garage than wet stuff. I don't mind it but I try not to have to clean up the 'mud' that you get when you use one vac for both; I don't have water in the garage so it's not easy to do it and I don't want to make the whole garage smell bad when I need to use the vac.
Here's what I have to say about the big vs small suggestions. I had a small 2.5 gal and it was ok to carry a full one dump it, its more awkward than 'too heavy'. If I was working with mixed dry/wet stuff or needed to take it a lot of places, I'd still have one of those. I sold the small one to a friend and got the bucket top style for wet stuff. Easier to carry a bucket handle when its 'full' of water (prob 4 gals) and I have a stack of 5 gal buckets anyway. Also I don't have to remember which filter is in which vac or change it mid-job if something spills, etc.
Based on my experience with Ridgid & Shop-Vac, I would buy a Ridgid every time. The Ridgids are also the same as Cman most of the time so the filters are great items to add to get 'free shipping over $**' or to make sure you get hose/attachments without needing adapters.