The 100 loop gets a lot of foot traffic, bikes, and golf carts threw it because there is a short cut threw there to the boat docks not a big deal but when MK is open late people will be walking threw late.
The 1400 loop is right by the camp fire / movie so you would probable here whats going on there. There is also a cut threw to the camp fire here so again foot traffic, golf cart, and bikes will be a little more. But you are centrally located to a lot of what FW has to offer.
300 and 100 both have access to nature trails. Hopefully this helps you pick a loop.