Krell Kct vs ARC Reference 2 MK2

Which would you Choose?
The krell 
How can you compare solid state with a tube pre amp.Doh!
Rvito, what do you plan to use one of these pre-amp's on? 

which power amp(s) are you planning to use?
Second note;
I would match Krell w/ Krell if going solid-state.
Keep me posted & Happy Listening!
Krell Fbp 400cx
The kct is a made fit for the amplifier you are using,  may not be the best for your amp,  better  than  th Arc reference 2 though.