I like reverse grip because I tend to rush the attacker, coming in close and finishing there. It is also possible to hook with the blade, redirect attacks and so on. Also, it is very useful as a quick-draw grip from inside waistband carry.
Saber grip of course is more useful in long-distance. My definition of saber grip is a grip where the "focus" of the grip lies in thumb and index finger, like in a foil grip. It is very flexible, but I don´t like it very much because I feel that my saber grip is quite insecure. I prefer a hammer grip with more or less loose thumb and index finger, but tightly gripping pinky, ring- and middle finger. The blade is more "anchored" in the palm of the hand; very useful for full-impact stabbing, while having adjustable flexibility: From very flexible (loose thumb and index) to very strong (tightly clenched fist).
Just my few thoughts on the topic.
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"Peace is not without conflict; it is the ability to cope with conflict" - Leo Giron