Valken for for budget players. It is made of plastic and pot metal, unlike Redline and Ninja which is billet machined.
As for the Polarstar pic above, I like it. There is cheek rest now for it.
You will see both remote and on-gun set ups. High volume players will op for remote. I like the idea of on-gun, but not the limited shots, unless I carry an extra 13ci tank with me into the field.
On-gun would be just right for indoor games.