Heat sink style trans coolers?

Heat Sink : 2 Pass 20" Heat Sink Transmission Cooler Kit
Or
https://derale.com/product-footer/fluid-coolers/transmission/frame-rail/13220-detail

I've been looking at these for awhile now, anyone have real life experience with either style?
Car is a 72 Demon with a 408, 727, 3.91 gear, mostly street driven/cruises, tracked maybe once a year, occasional excessive fun on the street......shhhhh. I have a traditional trans cooler now. The lines where ran kind of stupid by the previous owner.
Main goal is to clean up the radiator for better air flow and to add an auxiliary fan for hot days/cruises.
Not too much of a fan of the radiators with built in trans coolers. Would be mounting either style below the drives seat on the inside of the frame rail. The frame is tied so I have a mounting option.