Between the two, I prefer the Thiels because they are so revealing. For my taste, the Revels are too laid back. I fully support Jdevine's observations about the great customer service at Thiel. But, from my experience, the Thiels can be a bit harsh sounding when partnered with a bright amp -- synergy is critical with any speaker. When I owned the Bryston amps, I needed to move to MIT speaker cables to find the magic with my Thiels. If the Krells falls into the "bright" category, you may want the Revels if you don't want to change too many other parts of your system (it's been a long time since I've heard Krells so can't remember how they sound). Otherwise, my vote would go to the Thiels based on my tastes.
