The F and zero turn are both mowers and that's the common feature. You can get 2 zero turns for the price of one F. The F can add attachments, not many different ones but can and zero turn is a mower and mower only. Servicing the F can be done easily for almost every part and zero turn is a chore like most mowers. The only feature the zero turn would excel in is the turn radius. The turn radius of the F is the width of it for a 180 turn (turn steering wheel complete turn and it would be like locking one wheel and it swings around a radius the size of the width of the tractor so one can mow a row, turn and come back on the row beside it but not straight back on what has already been mowed. The F will circle a fair sized tree based on the size of the deck, mine arte 6' decks.
The F 4wd and probably 2wd will go and return (important that you can return sometimes) where no zero turn can go.
The Fs use a steering wheel which most people can control and the zero uses 2, not one, but 2 levers to control it's direction and turns which requires some coordination.
The F has the deck out in front which makes it longer and where your cutting very visible which a person has to decide if that's good or bad. The F front deck can go under overhangs and the zero cuts under you so you go where the cut is.
F or zero??? Not in the same league but both are mowers, well one is a mower and the other can also mow better than any machine made and also do other jobs, limited, but some other jobs.
As with most, I'm sure it will come down to the money. Buy the one you can afford and be satisfied you bought what you could afford. Maybe not the best one but maybe that can come later.