Midrange · Both Understable
The Discraft Comet (4/5/-2/+1) and Westside Discs Tursas (5/5/-2/+1) are both midranges, and they fly very similarly.
The Tursas is the faster disc (speed 5 vs 4), needing a touch more arm speed, while the Comet 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 76 m for the Comet versus 83 m for the Tursas.
The two fly alike in shape, so it comes down to speed: pick the faster Tursas if you have the arm to drive it, or the Comet for an easier, lower-power flight.
The Tursas is the faster disc (speed 5 vs 4), needing a touch more arm speed, while the Comet 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.