4 DH or 4 DK?

[StephenMB]

So been going non stop on my trinity (War/Dru/BMX3) - ready for a little change just to break the monotony and been wanting to do a melee team with a class I haven't run...So since i have't done either DK or DH, what do you guys recommend will allow me to do some m+/heroics and other end game stuff more efficiently and easier?

I have 5X120 Boosts
1 Resto Shaman or MW Monk and:
4 Havoc DH
or
4 Frost DK
or
4 Unholy DK

Or I might consider 2X2. Like 2 DH and 2 FDK, or whatever combo... would rather do all same sub but if it will give me a significant advantage to do multiple subs I will. I just know literally nothing about the 2 classes so asking here. Only interested in DK and DH just FYI. Have plans for a Warrior team later. Also, if 4 DH is the decision, probably shouldnt use my 120 boosts on them since they start at 98, right?

I will be setting up pretty elaborate single target and AOE macros, as I have for my other toons, once i figure out the rotation that will use most of their abilities, so will primarily just be spamming those.

As usual, thanks for any feedback!