Trinity force + Zephyr gives more movespeed than any boots(apart from mobility boots out of combat, but even then this combination should be able to closely compete with them).
What about the specific boots bonuses?
Zephyr gives tenacity. Zephyr gives attack speed. Zephyr gives cooldown reduction. It is simply a combined version of most of the boots. The only stat it doesn't inherit is Ninja Tabi's. Getting Ninja Tabi's is a reasonable argument against heavily auto-a…