I'm not sure any brands have issues with ball diffs, it's more of a personal preference thing (and current trend!) if you ask me. They are just different!
From the advice I've been given gear diffs should work better on consistent, smooth and high grip tracks (indoor/carpet for example) whereas a ball diff should to be better for varying/low grip/rough tracks.
I'm told gear diffs generate more drive when the grip is good, but a ball would feel more balanced when grip is less good.
And don't be fooled into thinking a gear diff is less maintenance either, from what I've been told gear diffs need attention too as they tend to loose oil, some slower than others, but oil checks are needed. Not sure what is worse either, a worn ball diff or empty gear diff?
Treat them as tuning options, not all round solutions!
AE are just slow to react, they do have a gear diff from the SC & RTR that some people are fitting I think, but you need the right car/gearbox/bearing combination for it to fit!
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