How bad blood DK (tank) vs Prot paladin is
Hello fellas, I have spent some amount of time tanking dungeons and few raids with Protection Paladin. Not that I am bored with the paladin, however, I wanted to try something different to experience another tank. My attention was caught by the blood DK (or frost for dungeons) but most of the raid leaders are searching only for paladins. I started to collect opinions on why they look only for paladins and they mentioned (DKs are squishier).
Here is my question, how bad DK is compared to the protection paladin in the mitigation aspect. I am aware that DK could provide some solid self-healing, however, I am not quite sure how this would be useful in ICC for example since most of the time the healer will overheal me.
In addition to this, is it better to tank in Frost spec while farming gear/collecting EoT RDFs due to the better AoE?
THank you.