Which thief skills are worth using?

My MC is currently a thief (level 45), spamming heavy attack 3 with a bow from the back row. It's decent single target damage, especially with the thief's bonuses to surety.
But I've been wondering, are the hiding+sneak attack or poison/bleed skills worth using and leveling up? To clarify, my MC isn't intended as main dmg dealer, but as secondary healer and dps, depending on what's needed.

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u/BregaladHS — 1 day ago