Another Ram question, transmission

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In the 3500 late model there are 2 automatic transmissions offered the AISIN and a 68RFE. Depending on the differential ratio the AISIN has 4-8K more towing capability although payload specs are a bit less 100#+- again depending on the differential ratio. The published towing weight for a 2016 CC DRW long bed with 68RFE is 16600 - 21600 depending on differential. 20510-30660 for the AISIN. I'm not likely to be in the 20K-30K 5th wheel range so is it worth it to search only for the AISIN. I hate being "under trucked" but don't want to specify something not really needed. Trailer I'm probably going to end up with is a Solitude at 15K GVWR. Any downsides or notable benefits to either one? Other than the obvious more towing capacity that is.

[mobilemike]

One downside to the AISIN is there is not and supposedly never will be any performance tuning available for it.

If you are a guy who wants to delete or do some shifting tuning stick with the 68RFE.

the 68 is a much better trans than the earlier one and does not suffer the failures of the past.

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Found an older post dealing with same issue.