From my own experience with an s6 and a gear vr I think the s7 would be a better experience than the s7E when coupled with the gear vr.
Youtube settings > General > Limit mobile bandwidth setting.
YOUTUBE clip
My S7 Edge only allows me to choose up to 480p
My PC allows up to 1080p
So your S7 or S7 edge can play this you tube video clovis linked to at 1080p ?Mine does up to 1440p if the video is uploaded in that, other wise 1080p.