Here's my experiences, they may be different for different cars, tracks, driving styles, level of grip, etc. but here you go:
Car #1: RC Lab 7even 6.0. This is my asphalt car, it has a one-way diff in the front and a medium-tight ball diff in the back. This car gives both excellent turn-in and exit steering, but does take a certain amount of skill to drive it correctly. When done properly, I believe this is the fastest combo.
Car #2: AE FTTC3. This is my carpet racing car, it has a locked diff (also called a spool) in front and a medium-tight ball diff in back. This car has much less turn-in steering, making it more controllable and predictible than the one way (but wastes more speed) and feels exactly the same as a one way exiting the corner.
Car #3: Losi street weapon, my backup car. This car has a middle one way pulley. The one-way pulley gives slightly more turn-in, but feels exactly the same as a traditional dual-diff car on exit. This isn't the best configuration for any car I believe, because you still have some (although very minimal) slippage on the front diff unlike the spool and one-way diff on my other cars, which allow you to "shoot" out of corners because of the level of grip they provide.
Hope this helps.