I use a bivy tent but in an area like Minnesota or Canada where mosquitoes/black flies will tear you apart, you might want to get a bigger tent so you can sit up and relax while the nasty blood sucking critters have to settle for being on your rainfly. Depends on the area you are going to be in. Trust me, you won't want to be outside for long in an area where mosquitoes will feast on you. Weight & size while important, is nowhere near as important as it would be for someone hiking the Appalachian trail.
Haven't tried the hammock but since I like to sleep on my belly, I can't see them being comfy for me.