Note that I had refrained from doing any tests with the Odin Layer because of its recent ban.
Wvyern Heavy Zephyr vs. Valkyrie Heavy Xtreme
Wyvern launched first all matches.
WHZ: 13/20 (9 BF, 2 SF, 2 OF) - 65% win rate.
VHX: 7/20 (ALL OF) - 35% win rate.
WHZ average clicks lost: 1.05 clicks.
VHX average clicks lost: 2.3 clicks.
Benchmarks
Wyvern Heavy Accel vs. Valkyrie Heavy Xtreme
Wyvern launched first all matches.
WHA: 10/20 (1 BF, 9 SF) - 50% win rate.
VHX: 10/20 (ALL OF) - 50% win rate.
WHA average clicks lost: 1.05 clicks.
VHX average clicks lost: 1.45 clicks.
Wyvern Heavy Needle vs. Valkyrie Heavy Xtreme
Wyvern launched first all matches.
WHN: 10/20 (1 BF, 9 SF) - 50% win rate.
VHX: 10/20 (8 OF, 2 BF) - 50% win rate.
WHN average clicks lost: 1.7 clicks.
VHX average clicks lost: 1.3 clicks.
Overall, it definitely seems hard to say which of the three Drivers is better with how close each set of results were. With Accel not being as gripped to the stadium floor as Zephyr and Needle, it may be safer to use those as opposed to Accel. All three Drviers, however, all seem to be viable options for Defense.
Deathscyther Ring Zephyr vs. Deathscyther Heavy Defense
Zephyr launched first all matches.
DRZ: 15/20 (14 SF, 1 BF) - 75% win rate.
DHD: 5/20 (ALL SF) - 25% win rate.
DRZ average clicks lost: 1.15 clicks.
DHD average clicks lost: 1.6 clicks.