I have a nexus 8 premium on my Gazelle it works great with the Alfine trigger shifter or the Nexus grip shifter,
The Alfine trigger shifter is more precise, and the Nexus grip shift is faster as it allows skipping gears, or selecting any gear in one shift.
One thing I really like about the Shimano 8 is its 5th gear is a 1.0 ratio where the SA 8 1.0 ratio is first gear. It seems the SA 8 is meant for 20" and smaller wheel bikes.