Both Sarah Michelle Gellar and Lucy Lawless were the biggest female leads of the '90s in action / drama TV. Xena: Warrior Princess and Buffy the Vampire Slayer made a huge impact on the LGBTQ community and are still listed on favorite shows of the '90s.

But SMG haven't gotten any successful roles since Buffy. She tried several movie roles that were mostly DTV. She also tried The Crazy Ones and Ringer, which were both were cancelled after a season.

Whereas Lucy Lawless is still either getting supporting roles or lead roles
Roles Lucy has gotten post-Hercules & Xena:
Spartacus (lasted four seasons) Salem (lasted three seasons), Ash vs. Evil Dead (lasting three seasons), Parks & Recreation, Battlestar Galactica, The WB's Tarzan

She's had several guest roles as well.