Re: 9' 8-weight versus 11' 8-weight (switch)?
I use a 11 foot switch in the surf for stripers. Couple advantages.....very easy on the arms and shoulders during the cast, always 1 back cast, extra rod length gets you above the waves. The disadvantage is landing a fish with sucha long rod. Very difficult to reach the leader without high sticking and breaking the rod. Best to beach fish.
Best advantage is easy long distance casting