Help me understand computer options

A spreadsheet would be great, but I'm afraid it'd be so far above my head like every thread here I've read that it probably wouldn't help me. So far, options seem to include:

Factory based
Hotwire
Modern Muscle
A2speed/B&G - seems to be the only one that might be able to make use of my factory harness/PCM

Custom
FAST XFI
Holley Dominator
Hemitronix - Chevy based
lxmodguy (MS3 based?) not sure if this ever materialized

MS3 based
EFIsource MS3 gold box

Some of these seem to require cable-operated throttle bodies

Did I miss any? Does anyone want to fill me in on the pros/cons of these?