Probably the most important part of the clean and lube is the cleaning part. On a modern o-ring or x-ring chain you want to keep road grit from chewing up the seals that keeps the factory lube around the roller pins from escaping. Chains don't actually stretch over time, what happens is the pins gradually wear away and the distance between each link increases. Keeping the pins lubed slows that process down, which increases the lifespan of the chain.
So clean your chain thoroughly with kerosine or a commercial chain cleaner, then let it dry before you apply lubricant. Kerosine can be bought at most hardware stores, or if space is limited most lamp or tiki torch oil is kerosine. Beyond that, what lube you use isn't as important. I've used all the major brands I don't think that anything actually outperforms 90 weight gear oil. Use whatever floats your boat, but take the time to get the chain clean before you apply new lubricant. Oh, and take a moment to align and tension it properly, too.