What type of rifle and what are your goals? The brand of rifle matters too. I'm going to provide an answer assuming you're talking about a hunting rifle.
I've used McMillan, Brown Precision, Hi-Tech Specialties, B&C, HS-Precision and a couple of others on bolt action hunting rifles. On a sporter weight hunting rifle I much prefer the McMillan Edge. They are pricy, but strong as an oak slab and about 1/2-1 lb lighter than most anything else. If weight savings isn't important you can save about $100 and get the standard weight stocks.
I've always been able to open the box, bolt it on and go shoot with excellent accuracy. I do place a small bit of bedding compound in the recoil lug recess. I don't think it helps, but is easy and doesn't hurt. Most of the others will require fitting by a gunsmith which adds to cost.
On a varmint or target rifle B&C is considerably cheaper and as good as anything else. Just too heavy for a sporter weight hunting rifle.
I've never used Manners hunting stocks. But they are a quality stock built of the same construction methods as McMillan. Same with Brown Precision and Hi-Tech Specialties. All 3 are good, but have different shapes and styles. You have to decide which style suits you better. McMillan offers by far the most options, but that doesn't mean they are a better stock. The quality on all of them is similar.
B&C and HS-Precision use a cheaper method of construction. Their stocks tend to be heavier and thicker. They have to be that way in order to have any strength. But they are considerably cheaper.