I opted for the gel insert, when I ordered my LePera seat, and am very pleased with it. Most comfortable seat I've ever owned.
Vendors who downplay gel, because it doesn't "breathe", are basically full of shit. Think about it. Your seat is covered with waterproof vinyl for crying out loud. That's the first thing your butt comes in contact with. What's beneath it isn't going to "breathe", no matter what it's made of. Lots of businesses like to downplay products they can't, or choose, not to offer. Take it with a grain of salt.
For keeping your rear end cool, it's hard to beat a sheepskin pad, that allows air to circulate between you, and the seat.JMO.
2009 Vivid Black FLTR/120R/Dewey's headwork/TMan 625G/Fuel Moto XXX 2/1/2 w/4" mufflers/HPI 55