I reckon I get more aroma using pellets, with my limited experience. Oddly enough I think the aroma can be different, too, I had Styrian pellets which were much more citrusy than their whole flower counterparts. Could be a different 'vintage' though. Also I reckon dry hopping is better with pellets... no nasty grassy flavours.
I've got some of that inoxia mesh, i'm not doing the hopstopper clone, instead i'm just sewing it around my existing manifold - think that will work? Sewing with metal is a bugger :evil: