I'm a patient man but I will admit that if I could I'd kill off all the Clematis on my grounds.
And the clamatis would stop killing my trees and bushes.
Mayby I'm just unlucky, but then again the Clematis had decades to establish itself before I got here.
As for Hosta I'd suggest you choose them for their size. You want them to outgrow the goutweed, but otherwise work well with the space. I'm not sure that the smaller Hostas are tall enough to shade out the goutweed.
As far as I can tell, with the very limited harvests I've had, they all taste more or less the same though.