First of all Wyvern and Headspin are op and unfair catches with a nice dmg and aoe. The difference is that you can do way better combos after Wyvern Blade compared with Headspin. So WyvernBlade ends up in Wyvern, Storm Blade, Death Grab, Gust Slash, Sword Dance, naked man, Hammer, chaincombo, Bear1, awakening, Bear2, air combo.
And Headspin catch is like:
Headspin, Dragon Uppercut or smth like that -> jump out
Headspin, Upper Screwdriver, Aerial Frenzy, Cutdown to land faster with super armor, repeat.
Few differences from Overlords;
1st: Nearly that whole combo is super armored. More so at 60+.
2nd: Unless the target does a well timed recover or is really fast, it's infinite.
3rd: Doesn't get royally crippled by lag or relying on Death Grabs rng stun.
So it's actually much better.
Overlord is currently bottom of the barrel even with new and recent nerfs to others.