Tactical belts are so dependent on the user that broad declarations of what is best are meaningless, other than buying from a quality mfr.
For example, some folks like the outer belt to be rather short, while others like it so the ends of the inner belt are about an inch or so apart while wearing summer clothing. Reason for this is that your outer belt will fit over heavy winter clothing.
Most belts don't have any sort of means to prevent them from sliding up and down (or even around) your torso, except for suspenders. The HSGI gription surface works pretty well, unless the belt is heavily loaded, and that is where suspenders come in. Make sure your outer belt has four shoulder harness attachment points in case you decide suspenders are needed. If you use suspenders, even on a lightly-loaded belt, you do not have to cinch the belt so tight that it impairs movement, and becomes generally uncomfortable. In almost all cases, opting for unpadded belt suspenders is a good idea. The padding adds minimal extra comfort, and it is a positive discomfort if wearing the belt/suspender rig under a Plate Carrier. Make sure that the top portion of the unpadded suspenders is made from 1-1/2" webbing.
Most Tactical belts are comprised of an inner and outer belt. The outer belt is what most folks concentrate on, and that might be a mistake. The inner belt is what secures the whole rig to your body, and it is generally useful to have the inner belt as wide as possible, in order to add support to the outer belt. It is a frequent complaint (from people not using suspenders) that their (usually) heavily loaded belt not only wants to slide down their torso, but also wants to fold over on itself. A very wide inner belt can help alleviate this condition, if not wearing suspenders. So can the user-made addition of a thin (.060") HDPE outer belt insert, which will work wonders for most heavily-loaded belts, with, or without, suspenders.
A lot of folks buy inner belts with rather expensive Aluminum Cobra buckles. Nice buckle, but it's expensive, and heavy. It's intended purpose is to quickly secure/unsecure objects that might encounter heavy loads on the buckle. Very few of us will need this capability, and so the inexpensive plastic Cobra Buckle was invented. Less weight, and less money. Very durable; I've been using one on my everyday pants for a couple of years now. Frankly, I think most users would be much better served by using the appropriate width Fastex or National Molding QD buckle for the inner belt.
I hope this was of some use.