First time multi boxing: Which combination will prove strongest?

Hello. I've started my first mutli boxing project, bought 2 accounts and got RAF on all three :)

I have a few different combinations of classes i would like to do, which one do you who have experience believe will be strongest?
In short my restrictions are that on one account i have a 80 death knight/80 pala
and on my two followers im open to make anything. I will use my DK/Pala to boost the new accounts


1:
Ele Shaman, Arc Mage, Blood DK (during leveling)
Resto Shaman, Arc Mage, Frost DK at 80

2:
Ele shaman, Arc Mage, Retri Pala (during leveling)
Resto Shaman, Arc Mage, Prot Pala

3:
Fury war, Enh Shaman, Retri Pala (during leveling)
Prot War, Enh Shaman, Holy Paladin

4:
Fury war, Enh Shaman, Retri Pala (during leveling)
Prot War, Resto Shaman, Death Knight

2 is likely the easiest as many people believe pally's are the best fit for MB tanks.
1 is probably almost as easy, and may be more powerful (if you don't have a moonkin/lock)
3 & 4 both have melee and will be more difficult and likely not as "powerful." Added complexity makes it tougher to maximize individual skill, and melee exacerbates this dynamic.