I say GK. Merely because you strike me as much more of a marine player. Stylistically, we could argue until the end of days about the conversion and paint possibilities. Given that aesthetics is PURELY subjective, there is really no right or wrong, or even better answer. We can only give you our own supporting evidence.
GK don't suck on the battlefield. It is just that MANY people try to play them like regular SM, and they are anything but. Other than T, S, and power armor, they really have little in common when it comes down to how to play them.
I say GK... Purely because I know you want to test yourself, and the harder test (everyone, even 'nid fans have to admit) that will push your limits lays within the Grey Knights. Plus, a Grey Knight force is NEVER a large force, so you won't be that bad off really. IF you need help with vehicles, I can chip in there. I have several diagrams and schemactics, which I've drawn up for my own projects, that can be easily enhanced scale wise to ease the truescaling of vehicles.
GK FTW!
__________________  "Truth is infinite. It is defined by our perception of the facts; therefore we can never know absolute truth, we can only guess at it. A man who knows he has done no wrong needs no redemption, regardless of the views of others. The truth is what he believes it to be. A man who knows he has done wrong can only be redeemed when he chooses to forgive himself."
-Lord Inquisitor Balkoth
Black Saints Adeptus Astartes Chapter |