Having played from launch, I find advents easier to deal with than raids. Both are grindy, raids are even more so if you don't get any SSRs from the gacha, youre forced to deal with grinding all the souls while advents you can just get mats for the needed items and ignore the rest. Raid events have much better overall rewards because of its gacha but if just talking about eaiser to deal with, I would have to go with advents.