so far i own 4 militaries. regular s30v, coated s3Ov, m4 ril and s90v.
all have a very strong detent, that's a design feature. safer and helps you accumulate some force with your thumb so the knife flies open, "thumb flicks" ... but it can be hard on your thumb
other than that both need breaking in. when new the uncoated version may feel grittier due to the detend ball riding on the ridges of the satin finish, (especialy on the S90V and m4 version) the coated version will feel stickier.
but they are liner locks, whatever you do they won't be as friction free as an axis lock for exemple. the detent presses on the tang almost all the way to the fully opened position.
if you want to test your pivot tension, on a fully broken in knife, with a just right pivot tension, if you hold the knife horizontal and hold the lockbar against the G10 slab, the blade should fall by it's own weight.