DK spec for pvp Unholy or Frost

I just finish leveling a dk and want to do pvp what spec shoud i use?

go unholy for pvp

Go uh gargoyle op against newbs

unholy for sure frost is joke for pvp

Both are good, but UH has more brust and CCs

As someone who has mained DK for quite a while - frost is (way) easier to play, but also less viable than unholy.
The problem with DKs in general is their low mobility and rather weak self heal, and frost struggles with that even more than unholy does as as unholy you still deal some damage through your pet and dots (+ gargoyle) if you're out of range / LoS (and UH death coil selfheal is stronger than frost's).
That being said, if you manage to stick to your target in melee range as frost, you can dish out some insane damage in short amounts of time. I'd consider it a slightly handicapped glass cannon.