Whichever one you like the look of more. In regular matchmaking they're both viable. If you want to attack the opponent's health bar go with Hitokiri. If you want to fight for the green bar (stamina) then go with Jorm.
I would say Hito is the safer choice. Both kits have a bit of nuance to their playstyles but I feel like hitokiri is easier to get into/more forgiving. Jorge requires you to basically turtle up to make the most out of him.