Krell will give you better grip on bass but with a good speaker can sound a bit metallic or "etched" in mids.On other hand Plinius has very "tubey" SS sound that might or might not side by side be your cup of Tea.Depends on your other gear,wiring,and your tastes.I sold Krell way back but would probably go with the Plinius myself.On some very forgiving speakers or ones that aren't as much in need of tubes like the B&W's as they were inherently "warm" I slung with the Krell it worked Krell was fine.
Chazz
Chazz