Buying my first bike: Used 2021 Specialized Allez (used) or Trek FX3 DIsc Gen 3 (new)

I want an entry level bike but I’m not sure if I want a road bike or both road/gravel. I found a sale on Trek FX3 Disc Gen 3 for $650 (taxes included) on Trek’s website. There’s a used Specialzied Allez posted on Facebook for $400. Which should I choose? I’m 5’4” in height.

Link to trek FX3:
https://www.trekbikes.com/us/en_US/bikes/hybrid-bikes/active-fitness-bikes/fx/fx-3-disc-gen-3/p/35021/