(Just out of curiosity, why did all of "Da Ork Boyz" here choose to be Orkz?
My reason is because I found them to be the most enjoyable "fun" faction in this grim dark setting.
They fight because they like it, and they have fun.

As an aside:Sorry if this topics already been made before, just link to the original and close this if that's the case)

Because I couldn't choose Imperial guard and I don't want to be a beakie/spiky beakie.
Also, the Orkz are a lot of fun to act out.

Im a nid fan but orks are my second favriote faction and i dont like any of the others

(Yep, someone had to do this at some point)

Wot you blabberin' about ya runt? I'z an Ork cuz I'z green an' mean!

Da fact 'ez askn dis iz a bad sign

Because they're one of the few remnants of true Second Edition humour left in Warhammer 40,000. They can be utterly ludicrous in every over the top way possible, grim beyond all reckoning, show complete loyalty, backstab one another, be competent beyond human understanding or pull a Wile E Coyote, all without breaking character.

(That's just a good reason to go Ork overall)

because green is best duh!