Jatco RE4F03B fluid type

Servicing this high mileage unit soon.

Fluid is dark, no burnt smell. Napkin drop test still has a dark red tint.
Shudders at part throttle between 30-40 when ambient is above 40F

Current fill unknown, but probably some generic dex 3.
Jatco calls for Nissan Matic D.

I have three options and I am thoroughly confused which one to pick.

Valvoline Dex VI official licensed fluid
-premium synthetic base stock and advanced additives program targets include durability, anti shudder. cst of 6.0...

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