Worlds Strongest Swordsman was always a superior title to Yonko.
1 is literally a title of strength, "World STRONGEST". The other is a title were sure you do need to be strong (not the strongest in anything bare in mind) but also need to have a big enough crew, either in numbers or strength (or both), have territories and influence in them regions.
Clear cut example is the weak gag character Buggy becoming one, because of his actions in "recruiting" (politics at work) Mihawk & Crocodile. No Strength was ever mentioned in Brannew's reason of him becoming a yonko.
Lastly, none of the Yonko (previous or current) would've ever become a yonko with strength alone (even Whitebeard & Kaido with their World's Strongest titles). Therefore WS > Yonko
1 is literally a title of strength, "World STRONGEST". The other is a title were sure you do need to be strong (not the strongest in anything bare in mind) but also need to have a big enough crew, either in numbers or strength (or both), have territories and influence in them regions.
Clear cut example is the weak gag character Buggy becoming one, because of his actions in "recruiting" (politics at work) Mihawk & Crocodile. No Strength was ever mentioned in Brannew's reason of him becoming a yonko.
Lastly, none of the Yonko (previous or current) would've ever become a yonko with strength alone (even Whitebeard & Kaido with their World's Strongest titles). Therefore WS > Yonko