I own both. I would throw the Wilderness 5-stitch in there to round out the top three belts everyone should own but then again telling you to buy them all probably won’t help you.
I like them all for different things but I’d say I use the Arc belt 90% of the time, the Wilderness 5% and the Ares 5%. I think it would depend on who you are and what you plan to do with them.
M4Guru gave you the short answer. The Arc is designed for less of a load than what you listed and you’ll get droop and roll the edges with that much weight on there.
Really, if you’re looking to support heavy loads, the Ares is still the best, followed by the Wilderness, and then the Arc.
But if you’re running relatively slick or wearing it every day for long hours, the Arc is the best choice because it’s the most comfortable by a longshot.
The cutoff point? It depends. The Arc is comfortable and functional with a full size pistol and two mags of your choice. No problem with that at all. Two pistol mags, two rifle mags, or one and one. Add an extra (third) loaded mag and you’re pushing it, but that’s probably the cutoff.
Arc Positives
+Ultra light, ultra thin
+Doesn’t look like a “tactical belt” and you can wear it every day 10+ hours
+7075 T6 swami buckle is very low profile and never digs in or sticks out
+Truly feels like you’re not wearing a belt
Arc Negatives
-Will not support heavy loads like the Ares scuba style will
-2" wide design may not fit through certain pants you own
-2" wide will probably require all new connections for your belt items
-Belt end will NOT fit through Raven loops without mod
-Needs some finishing details to be used as a true gun belt (razor off Arc tags & extended loops, measure and trim extra long belt end and re-seal)
Note: I recommend leaving at least 5" or 6" of tail if you end up chopping the end off. This gives you a little room for adjustment. Make sure you chop AFTER you put your holster and pouches on, and get it set up through your pants. This will change the measurements a little bit. After all that, mark the belt and cut it with a super sharp knife on a cutting board. The trick? Chuck up a piece of thick aluminum stock in a vice and heat it up with a torch. Get it really, really hot to the point where it will melt the plastic like nothing. Now carefully take the end of your freshly cut belt and press down firmly on the superheated end of the aluminum to melt it a little bit and give it a flat perpendicular sealed edge. If you want, test this on the piece you cut off, first, to get an idea of how it will react. Give it a slight bevel on the top edges (almost like an arrowhead) and roll it a few degrees from side to side to shape. You may have to seal one side, then re-heat the aluminum and bevel the edges. In the end you’ll have a perfectly sealed (and beveled) shorter belt end that will never come undone and won’t be dangling 12" off to your side. Plus it will fit through any hard belt loop you own.