Both beat a bare stock seat — but they age very differently, and that's where the real answer lives.
Gel pads feel plush on day one. The problem shows up with miles. Gel is a dense polymer: it conducts and stores heat, so on a summer ride it soaks up sun and body heat until you're sitting on a warm brick — riders call it "hot monkey butt" for a reason. Gel also migrates under constant load. Over months, it packs down and thins out exactly where you sit, which is exactly where you needed it. And it adds real weight to whatever you strap it to.
Air cushions work on a different principle. Instead of a solid mass absorbing your weight, dozens of interconnected air cells let air shift between chambers as you move, spreading pressure across the whole contact area rather than your two sit bones. Air doesn't pack down — if the pad softens, you add a puff of air and it's new again. Air also circulates under the cover, so it runs cooler. The honest trade-off: there's a short dial-in period to find your right inflation level (less than you think), and an overinflated pad can feel wobbly until you learn that.
For rides under an hour, either is fine. For the long days where your back actually gives out, air wins on pressure spread, shock absorption, heat, and lifespan.
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