Personally, I prefer it. It has pretty much all the important features of itch, and a really good game api (that automatically disables itself when the game is online and the debugging console is openend to avoid cheating) that permits to have trophies, scoreboards and to store data on the account. Pretty much what facebook instant game promise but without the struggle and partage possibilities limitation and with trophies. I made an extension that already handles the trophies and scoreboard (I think I don’t know anymore if I released it.) on the same page as the debug console extension. You can get a test trophie if you start the online game.
The second thing I like on gamejolt is visibility. There are so much games on itch that they “drown” in the mass of games and not much people discover it. Or at least it’s my most probable guess. I only noticed that there is much more people downloading my stuff on gamejolt than on itch.
A last thing is “monetization”. When you create an online game, Gamejolt will automatically display ads next to the game canvas, and you get some money back out of it.
The only thing that I think might be interresting but are missing on gamejolt are Sales and Coop-Bundles. Well, theoretically you can publish a gamelog telling sale and reduce the price of your game before switching it back but that’s not the same.