They're really different types of frames. The Cross Check is a multi purpose frame with horizontal dropouts and a derailleur hanger spaced for road or mtb geared wheels. It also has cantilever brake bosses and can take huge tires. The Phoenix is more like a Kilo WT with track dropouts and 120mm track spacing that can take medium fat tires but not nearly as large as the Cross Check. So, it depends on how you want to use this frame.