Crimson, easily.
Tangle looks pretty and all with its 10 INT, DCI and MR... but lets face facts. If you play a magic oriented character you probably already have tons on your suit. And 10 extra hit points from the Crimson can be a lot when engaged in combat.
Without Tangle, I have 13 MR, 30 DCI, 120 med and focus, 175 mana and 135 hp (human character, that's without holding a shield or spellbook). Given the diminishing returns of MR, it just seems to be a better bet with a Crimson.