Sell me on a DK spec for northrend

Hey there, currently playing a DK on Onyxia and loving it. I just hit 70 and started questing in northrend and need some help settling on a spec for now. Mostly solo questing/open world with a bit of dungeons mixed in. Currently playing unholy
And it’s pretty good but sometimes feels squishy (usually if I mess up), I tried frost but that didn’t feel good either. I’ve been curious about blood because it’s “unkillable” but everyone constantly talks about how bad the damage is.

If anyone can help nudge me in the right direction I’d appreciate it!

Go Unholy (as you said "it's pretty good"). See if there are a defensive talent or two to your liking. Did you ever try other presences, namely frost, for those times when you felt squishy.