Sparc Mac for skill, entertainment and good pking and No1s Perfect for entertainment, I don't watch any other RS videos really other than those 2 and RuneShark.
I only really watch Sparc Mac. The lil willis thing is pretty gay tbh but I think his videos are extremely entertaining, well edited, and hes got mad skills. By far the most unique PK vids I have seen since I have come back to RS. I also watch No1's perfect sometimes as he has a TON of videos, some are really cool And other than that I usually just watch guide commentaries and stuff.
Back in the day I was a huge fan of I mahatma I, 3 hit u, and devil dante. If you watch their vids now its so oldschool haha, shitty ass music and they usually show the whole fight. I still love them, but most people I have showed them to think they are extremely boring. Miss the old days!
I forgot to add that I also watch Nightmarerh from time to time. When I first watched his videos I found him very annoying, but overtime I have come to love his videos, rants, and when he attempts to go PKing. I just love how he doesn't give a fuck, he does what he wants.