Not Troll, but I'll answer anyway.
Outboard clutches allow for a slimmer crankcase design. They put the 'strain' of the chain drive closer to the center of the crank. They run cooler. They're not harder to clean, quite to the contrary. They have no E-clips to lose. Anyone with basic motor skills can change a bar and chain on an Outboard setup within ~.3 seconds of what it takes on an inboard.
Inboard's only Real advantage is if you're pinched, and have to remove the powerhead from the B/C. Even this can usually be accomplished on an outboard saw.
For someone that knows how, rim drive changes aren't really any harder/slower on an outboard than inboard, and no darn E-clips to lose.
I LOVE my 372, but I don't like E-clips.
That said, I think the stihl 044/440 is one of the all-time great saw designs. Just not better than a 372.
I don't like E-clips.