Guild Wars 2

Renewing Stamina will give 5s of vigor upon a critical hit: more dodge rolls.
Windborne Dagger will give +25% movement speed while in combat: move faster round your enemies.
What do you use and why?

Vigor. It’s not even questionable, you have perma swiftness anyway.

Next after the Stability the Vigor is the most powerful buff in this game.

You should get (near) permanent out of combat swiftness with traits/runes. 75% swiftness uptime is equal with perma 125% movement speed.

Renewing Stamina is a million times better than Windborne Dagger outside of Open World PvE (and even then, you usually just take Air Signet instead).