Fairway Driver · Both Understable
The Latitude 64 Diamond (8/6/-3/+1) and Westside Discs Underworld (7/6/-3/+1) are both fairway drivers, and they fly very similarly.
The Diamond is the faster disc (speed 8 vs 7), needing a touch more arm speed, while the Underworld comes up to speed at a lower power level. Both discs share the same stability rating, so they finish their flights very similarly. Estimated maximum distance is about 110 m for the Diamond versus 103 m for the Underworld.
The two fly alike in shape, so it comes down to speed: pick the faster Diamond if you have the arm to drive it, or the Underworld for an easier, lower-power flight.
The Diamond is the faster disc (speed 8 vs 7), needing a touch more arm speed, while the Underworld comes up to speed at a lower power level. Both discs share the same stability rating, so they finish their flights very similarly.
Neither — both carry the same stability rating and finish their flights very similarly.