In my opinion its defo worth having a geared diff as an option.
The ball diff seems better suited to low grip tracks as it helps generate traction without diffing out.
The geared diff is great on high grip tracks such as carpet or astro. Your able to achieve more rotation and more drive in a straight line.
Geared diff also has the advantage of fit and forget for most people. The only parts you ever really have to replace are outdrives when they wear out. The ball diff requires more maintenance and replacement of parts.
Both have their advantages and disadvantages so by having one of each, you can choose which to run depending on the surface.
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