The key choice in the Sage Arbor XL is spool size: 4/5/6 or 6/7/8. Both are extra-large arbor reels meant to pick up line fast when fish change direction and come straight at you, not just when they run. Sage pairs that with a narrow spool, which keeps the line stacking evenly without much attention.
Sage positions the Arbor XL for fast fish and high-pressure moments. The 4/5/6 fits lighter trout and flats setups, while the 6/7/8 gives you more capacity for heavier lines and bigger runs. If line pickup speed is the priority, this is the point of the design.