#1
I was looking for guitar strings on the ernie ball website, size 11 or 12, and in the categorie it asked what kind:
Nickel Wound
Reinforced Plain Steel
Pure Nickel
Stainless Steel
Coated Electric

What kind is best for rock, i dont want anything that will be slippery.
or if you have any other brand that you like or prefer
#2
Nickel wound will see you right. Just try some though, you may think differently.

Rock on!

EDIT: If you dont want slippery, dont get coated strings.
Gear

Gibson Les Paul Studio Ebony/Gold
Jackson RR5 Ivory w/Black Pinstripes
Epiphone Les Paul 100 *For Sale*
Yamaha FX370C
Marshall AVT150HX + AVT4x12