I use both Detol and Purell. Both are very similar. The only real difference is that they smell slightly different, and one isn't better than the other.
One thing Purell does have in its favour is the packagin is the best out of the hand sanitisers. The straight-edged bottle means it fits easier into the side of car door and generally looks better than the rounded containers.
Doesn't moisturise hands at all - I don't see how it can claim it maintains moisture when the product evaporates on use (therefore removing moisture from hands).
I love this sanitizer, have some anywhere I may need it (handbag, kitchen etc). Easy and effective to use. Has the typical sanitizer smell which disappears quickly. I find all sanitizers dry out the hands a little so make sure to moisturize regularly if using a sanitizing product.