Tim, unless you go through several hundred pounds of charcoal a year the cost difference is not a big deal.
Some cookers must use lump , ( most kamodo's)
Advantages of lump,
1) easy to light
2) burns hot if needed
3) very little ash
4) better taste???
Advantages of briquittes
1) a denser fuel, longer burns if your using a offset with small fire box
2) consistent burn & temp
3) cheaper ( between home & hunt camp 500+ lbs / year) & we can find on sale for $0.20/lb
As far as taste there are people who say they can taste the difference .
I'm nearly 60 & taste declines with age I can't.
Taste is different ( there are people who like liver