<<A supercharger is geared to the engine's rotating parts, like a
permanently mounted fan.
 They are notoriously hard on engines,>>

Not really.
Depend's on what engine your sticing it on.

Paxton has been bolting supercharger's on the front of engine for years
with good results.
You just can't overdrive the supercharger's beyond the engine's
capabilities.

<<Turbocharging is easier on engines but has a lag as the turbo spools
up to speed.>>

Yes and no.

Kick up the boost a little too high, and you'll blow the crank out the
bottom of the pan in no time.
Melted piston's are a big bonus with a big push of intake .

Supercharging requires horsepower to function (but can be balanced out
with the incresae of horses when it's doing it's thing), turbocharging
is a freebee.
It a by product product of the exhaust flow, but it's not a "right now",
when you mash the pedal boost in power.