Depends on your priorities.

IGHs need less maintenance.
They're often heavier - although that usually isn't particularly important.
They tend to have less of an overall range than what derailer gears can give you.
And/or bigger steps between the gears.
IGHs tend to have greater losses than derailer gear drivetrains.
Some discussion exists about the finer details of this comparison.
IE, Who'd "win" in a comparison between an IGH and a derailer gear drivetrain at a certain level of contamination?