Transmission Cooler/Cooler lines

All,
Looking for opinions on what you have experienced with Trans cooler and Trans Cooler lines.
Hoping My Demon will be mid 11's - small block w/904.
50/50 Street-strip.
There seems to be a lot of different ones out there??
Is a fan needed for trans cooler?
Looking at running -6 AN lines. Any Pros-cons to that?
I read a lot on here and learn, don't post too often.
Appreciate all the help!

Wally.