The priority is aluminum frame/steel fork like the head. Priority has people you can talk to on the phone, has spare parts available, has improved the spec of belt in the classic plus from what it was for a while, has been around and seems like they will continue to be around, has promotions, etc. I couldn’t find a compelling place listing the Head or any functional US site for the brand. The rear exit drop outs on the priority are obnoxious, especially if you put fenders on, but they do have alignment screws. The Head looks from the picture to have old style semi horizontal dropouts without any alignment aids that I could see in the pictures. These would be much simpler for removing the wheel, but potentially even harder to get things just right with proper tension. I have a Priority classic plus Gotham. It’s fine. I’ve modified it quite a bit for year round commuting. If you really want a belt drive bike but don’t have much budget, or you don’t expect to be changing your tires twice a year, it’s worth considering. If you know the step through is too small, consider the Large diamond frame, but if you’re close, the step through might be fine. The quill stem has adjustment room, it’s not a negative, and that can help. I like the parts spec of the Head better, but don’t like that it appears to be a drop ship only sort of thing. Also if it doesn’t have a center track belt I’d say no go. With either of these expect to do at least some fiddling and probably $100 or so to have a shop set it up.