Try LG V10, this is the better pick.
If you do not plan to use custom ROM....
I played with S5 and S6 Edge around a bit ... my current 1+1 and Z2 still feel faster.
Samsung devices are strong in hardware but Samsung makes bad software....TouchWiz is sh*tt*....hardly optimized, full with bloatwares, etc.
If you plan to use custom ROM...S6 Edge is good.