Tubes or Solid State?????

Thinking of upgrading from my Tandberg separates to either a Pathos Classic MKII Integrated, Primaluna Integrated or the Krell KAV400 solid state. I'm intrigued by the Pathos mixture of solid state and tube technology, and curious of the Primaluna all tube approach but I am drawn to the Krells offing of 200wpc as well. Any thoughts on this would be appreciated.