I would definitely give the floating variety a chance, not only does the hooks weight be negated it wafts up and down naturally on the bottom when legering in running water, or in still water. I could imagine whilst trotting the sinking variety could be helpful as you would never need to rebait, although I feel more confident with the real mccoy on the hook.
I caught my biggest roach on 1 rubber floating and 1 genuine. I was wading through plenty of smaller roach and decided to put the one fake one I'd got free with a magazine and, coincidence or not, the next time the float dipped it was a lot bigger than the rest.
I then promptly caught the tree whilst re-casting and lost my single fake maggot and it was back to the tiddlers.