Removal is what decided it for me, and it hasn’t come up in this thread.
Gel-X is soft gel, so it soaks off in acetone. Break the top coat, soak or wrap for 15-20 minutes, and the tips go gummy and slide off with a pusher.
Polygel doesn’t do that. It acts more like hard gel, so you’re filing most of it off with an e-file or a coarse hand file and soaking whatever thin layer is left. Without an e-file, budget a solid hour and expect your natural nails to look a bit rough if you get impatient. For a weekend project you’ll eventually want off again.
Also think about your lamp.
Gel-X tips are kind of opaque and fairly thick, and the extend gel has to cure through all of that. If your lamp is a cheap 24W thing or the bulbs are old, the gel under the tip stays tacky, and that’s a big reason full tips pop off in the first few days. With polygel, you can see and feel whether it cured because it’s right on top, so it’s more forgiving if your lamp is questionable. With a decent 48W+ lamp, either works really.
Gel-X needs the tip kit, a primer or dehydrator, extend gel, and a lamp. Polygel needs the tube, slip solution or 70% alcohol, dual forms or tips, a brush, files, and a lamp. Polygel looks cheaper up front, but the consumables add up because you’re filing away a chunk of what you paid for.
For this weekend, I’d go Gel-X, unless you already own an e-file and know how to use it.