I've tried both ways... I am still up in the air about it all... I've also tried bending and folding individual leaves.... I think it is VERY strain dependant. I believe that this method works best indoors with a mostly Indica variety, that has heavy branching, in that, the branches themselves seem to be seperate plants. (Know what I mean?)
On one occassion in which I stripped the leaves, the plants suffered incredible stretching, because they were getting no light from the missing leaves, so they were still looking for light and the entire grow was filled with individual buds instead of main cola's, however, the yield was incredible.
Another occassion, I did the same thing, the yield came out "ok"...
So, in the end, it seems that I get a more consistent yield out of "leaving them alone technique", rather than de-foliating, however, that one yield in which I got a lb and a half, out of 2 plants and a single 600 watt light, was really sweet.