I'd say pick the INT tradition from Street Grimoire that has the spirits and fluff you like best.
Healing isn't a thing you spend most of your time doing (unlike healer classes in MMOs). Heading is something that hopefully comes up as minimally as possible! Being good at casting Heal (the spell) is actually super easy. You should figure out what you want to do with the rest of the time you spend playing the game, both in and out of combat.
Things high INT people are good at: Perception, Assensing, Street Knowledges, Small Group Tactics
Things mages are good at: debuffing, elemental AOEs, easy stun spell takedowns, utility effects
Things everyone should be ok at: shooting, a bit of sneaking
Things trolls are good at: taking a couple hits, melee combat