IMO forcefields can feel more comfortable, but they dont work nearly as great as sneakersheilds in my experience. they are also not as durable. forcefields r more flimsy. youd have to keep replacing them.
sneakershields feel less comfortable than forcefields...but by that i dont mean sneakershields r uncomfortable. its just that u wont feel the presence of the forcefields as much as sneakershields. but that is mainly because sneakershields is made of a more durable plastic. if you install it right, you can hardly feel the sneakershield if at all.
and unless you have claws as toenails, you cant really mess up a sneakershield.