Fprime is very good with Monte Carlo GI renders. It is much faster than native lightwave's MC.
Kray has nice final gather and photon map options. It is a bit like Mental Ray's FG and GI.
They both have strengths and weaknesses. I use both.
Overall fprime is more accurate while Kray can be faster and cleaner.
Lightwave 9.5 is making strides in GI so you may want to hold out on kray until you try 9.5.
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