Depending to swing speed you may have different results.
For me a 16,5 fw will go further than 15 deg. because of higher launch.
I even think to move to a five wood. More high and easier to hit and very good carry.

Generally a faster swing speed should have more distance with lower loft.
But there are exceptions, like if you hit to low, your ball will find the ground to early.

Depends on the player. until you hit both side by side on a launch monitor, you are just guessing.

Brock is right, there are so many factors in the carry distance that relate to launch and spin. You may have too much spin or too little and that will impact how far a ball carries, Find a range or simulator with a trackman or something similar and go see what the numbers say. Good luck

I would hit both if you can, it also depends on where you need it in your bag and what you are wanting out of the club. More distance doesnt always = better in this situation.