Depends.
If the terrain is extremely well suited to glassing long distances, my SLC 15s and STX 95 get the nod every time.
If the terrain is mixed and not necessarily well suited to long distance glassing, my SLC 10s and STX 65 get the nod.
If the terrain does not lend itself well to long distance glassing, my SLC 10s and Kowa 554 get the nod.