EXTREME is for mountain bikes: mountain bike needs something that can take lots of dust, and/or muddy slop being kicked up on the chain from the front wheel.
ABSOLUTE DRY is for the road bikes: Road bikes generally tend to pick up more dirt and dust from static discharge, so a thicker, dryer membrane is needed.
GOLD is for both mountain and road bikes. A universal dry lube suitable dry dust and protection from slightly wet conditions.
HOLY COW is a very settled wet lube that is as clean or cleaner than most dry lubes. Dirt and grit can be quickly wiped from the chain unlike a dry line.
This chain lube moved the 21st. century closer to the 22nd. Drive-trains look like they just came out of the box. The well known smoothness and quietness that Rock N Roll lubes are known all around the world for. Works well for on and off road, so if you do both, or want a superior lube for either, this is the one.