There is no single best 8HP, adapter or controller. The swap-relevant generations, the full gear ratio chart, what factory torque ratings really mean, who makes adapters and bellhousings, and the two approaches to aftermarket control.
A complete overview of ASE's ZF 8HP conversion kit range — which engines and transmission variants are covered, why TCU support opened up the cheaper Dodge and Jaguar units, what every kit includes, and how to get a combination added that is not listed yet.
Why the adapter plate is the most important — and most overlooked — part of an 8HP swap.