Nearly all the motorcycle batteries sold today are AGM - sealed lead-acid Absorbed Gas Mat batteries. I doubt you can even find true "gel" battery for the Adv. They're generally considered better than gels and have the same property of being sealed and having no lliquid electolyte - the lead-acid solution is absorbed in the gas mattes. So whether you got Yuasa, WestCo, Excide, etc. is not going to make any difference in the battery type - it will no doubt be an AGM.
Some folks think Yuasa's are worth the extra $$$.