AFC 1 is the easiest and quickest to use. AFC 2 has more RPM points and an annoying joystick. The AFR has a lot of RPM points like the SAFC 2 and some other weird idle functions and learn mode, but it is the most annoying to use fuel controller ever invented. They make is do a little more than an AFC, but give you 3 knobs(You will have to most of the worst with just 2 of them) and a 3 digit led readout(I guess being able to have 4 and display 2000RPMs as 2000 was too fancy) to interface with, while the AFC has a nice screen and menus.
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