The way that you size your cartridge case is dependent upon each individual rifle. The use of the rifle. And the actual nature of the case itself that changes from cartridge to cartridge.
The advantage to neck sizing is a couple of things. First it normally wears your brass less, and you get longer brass life(more shots). Second it allows your brass to conform exactly to your chamber and can allow for more consistent velocities(notice I said can-not always).
Neck sizing is a good practice to be used on varmint rifles, and bench rifles, and any other hunting were 100% ammo reliabilty is not an issue. If you have a slightly tight casing it won't hurt you on a ground hog hunt.
But if you are big game hunting back in the mountains then you want to full size your brass, and make sure they function 100%. You don't want to mess up that once in a lifetime shot.
There are also concerns when it comes to different actions. Usually for a lever or semi. you should always FL size. Sometimes some guys even use a small base die for the rifles, as well as pump rifles. But that is another subject.
There are too many variables to say which is best. You really need to give all the specifics of what you want to do before you can make a real decision as to what type of sizing to do. Tom.