Like stated above, there are advantages to both. It's all about how you setup your rig. For instance, I might build a crawler with droop suspension that still has more ground clearance than someone else's rig with a traditional sprung setup. It also depends on the terrain that your running and your driving style. I've run droop, semi, and sprung. Personally, I like a well dialed in sprung setup the best. With the right shocks and mods I can still get a low COG, and have my rig handle better with my driving style on the terrain that we crawl on. Here in the Ark-La-Miss territory that I've crawled on so far, most of my crawling takes place on artificial rocks brought in for erosion. Because of this, there are lots of gaps and peaks, and its basically tons of smaller rocks dumped alongside a river, etc...
But someone in other parts of the country like the midwest, Colorado, etc.., might be crawling on large, smooth sandstone slabs that are very technical and require a completely different setup. Besides driving style, chassis and suspension setup play a big role, as well as the shocks you run, springs, length of rod ends on the shocks, etc... You can achieve the same low COG or belly clearance with a short sprung shock as you can with a semi droop long shock, etc...
The type of rig also comes into play. A berg can have twice the belly clearance of an Axial with a lower COG, and vice versa.
The biggest thing that I can reccomend it to crawl crawl crawl with your rig in stock configuration so you know it backwards and forwards with your eyes closed, and then start making adjustments. As we're all wanting to start modifying a rig as soon we get it, you will not know how the changes are truly affecting the rig unless you get to know it first in stock form so you have a constant in your mind at all times.
