Great job on the stand!!Depends... on a great many things.
My normal response to questions about stand height are to measure from your armpit to the ground, subtract tank height, that's your target stand height.
In my case, I'm an old fatman... don't like ladders, not standing on a chair. I tend to prefer fat, wide, low tanks anyway. When I built my current system, I went 18" tall, on a 60" x 30" tank, giving me about 140 gallons. Fit the room, fit the style I was going for, and mounted nice and low, I can reach the bottom easily. Since it's a peninsula, I can reach anywhere I might need to reach, without getting my sleeves wet. Perfect.
There is no equipment under my stand. Sump and other gear are all located in a closet behind the tank. As I said... old, fatman. I'm not working from my knees, so no matter how high the tank is mounted, it wouldn't have been high enough for me. By getting the sump and related gear out from under the stand, I removed one reason for a high stand. Sump clearance doesn't matter. For most, that is not the case, and a higher stand in order to gain space for equipment is a reasonable decision.
I know folks that want to be 'eye level' with the tank while standing. Eh. I don't mind sitting down in front of my tank. Since the tank doubles as a bar, there's handy bar stools all around for just that purpose.