The only advantage of pellets I can see

Some rifles seem designed for shooting pellets and provide excellent accuracy with two or three pellets.

For the occasional shooter of say one range session and a couple days hunting a year, pellets can be bought fresh each year, used to test the rifles accuracy and then shot off during the hunting season. So the one time expense is like buying a box of cartridges for your centerfire rifle in that case.

They load easier and can be carried in speed loaders so the whole idea of measures, etc is no longer necessary.

Down side..

The cost.

Not alway as accurate as loose powder

No cleaner burn or savings in the clean up department

Which ones are better

Only your rifle can tell you that. I personally like the Pyrodex RS pellets.