Generally I leave it forward covering my glans. Retract during pissing, sex or masturbation.
Sometimes I really enjoy retracting and tucking it back using the "spoon method" to hold it in place. It gives a nice feeling for me of it exposed and rubbing in my pants. It does take a little to get used to at first, but worth the initial irritation of the first few times. I reccomed giving it a try.
First picture is of normal retraction letting the skin rest behind the glans:
And the second is the skin tucked back using the spoon method:
When it is tucked back like this, it stays there as long as I like and it does not roll forward.