Well..
MS1 with Megasquirt n Spark EXTRA has (12x12 fuel/spark maps)
http://megasquirt.sourceforge.net/extra/index.html
Does it matter?! yes if you want a rock solid AFR all the way across the powerband, the more fine tweaking the better.
EXTRA also includes :
If you want to check out my car Daniel i can show you the ins and outs, I finally have a laptop for full tuning.
I can help with the install too