When I was after ice gloves this winter, and too freaking cold outside last winter, I just tried on everything, everywhere, new and used both.
I ordered mittens new, but the others all were tried on.
I ended up with thinsulate gloves from manzella, two different versions of gaunlet dry vent gloves from North Face, and a pair of HEAD outlast gloves. FWIW, I climbed ice in one of the no name used gloves, the thinsulate, because they were what I happened to grab, and the least bulky. No problem at all working tools, but I wasn't leading or belaying.
I've got very small hands, but stubby, which makes gloves a real PITA.
For belay gloves, I found weight lifting gloves without fingertips, real leather, and Velcro to close. They work really well!
Best, OLH