It depends on the type of blow. Predominantly one will be stabbing, and if it aids the motion, like most straight stabs with knives and swords where you don't turn your torso at all for any core power, you will tend to turn your hand, so there will be a change.
I've never really dicked around with polearms, but from the look of them you probably would not rotate most of them and their blades would be vertical most of the time, especially on the ones that do not have good symmetry (i.e. halberds).
Rifles with bayonets should always be used in melee from the ready position where the buttstock is basically touching your hip or near it and the muzzle is slightly high (inverse of low ready). It is also called the ready carry in US manuals that are a bit older like the Guidebook for Marines in many editions. You always keep the blade vertical when thrusting simply because most guns are awkward to be held at all for melee and it is the least awkward way. The more advanced and experimental the gun features become (carbine/short anything/bullpup), the worse and worse it is with a bayonet, as a general rule.
Wide shapes are great for combat knives because they don't break off in bones as easily.
[Do not forget to get your ass out and practice with anything you intend to use and be safe about it.]
-t longtime professional killer