Templar. 24k spell resist in light armor. Probably something like 27k if you take Breton, or Nord.

Orc

I think you need to narrow your focus a bit. I am a little confuse about what role you are actually trying to fill. If you want to do damage and you are worried about survivability, the answer is neither are great options. Both Stam and Mag DK are going to generally play in melee range as a DPS, and melee is always tougher to play as you are exposed to more mechanics. That said, Burning embers on a magic DK is actually a really strong heal, but you need to be on top of the boss to use it. Magic Warden is absolute last place for DPS in this game. Hard to recommend that to anyone. Stam warden is right at or near the top (i believe they are ahead of stam DK), but again, its a tricky class to master, and if you are spec'ed for damage, they really dont have a lot of innate survivability built in. Building tankiness into a group DPS build is counterproductive most of the time.

If you want a class that does good damage and can stay alive solo or with questionable support, far and away the best two options IMO are mSorc and mNB, with mTemplar as a close third. The difference, however, is that these classes stay alive with passive heals, not mitigation. Magic Templar is probably my recommendation for DPS that wants to break into group content because they have the easiest rotation of the lot, and you can easily build in some selfish extra healing if needed.

If you are set on one of these two above and are more interested in just questing/overland content, I would give the edge to the DK. They do a little better with crowed control and self heals that also put out damage. They also have the best selfish oh crap button in the game.