i find that the djetro version will be more fiddly to tune as it won't compensate for climate changes as much as an AFM version would....e.g on a cold night your afm will show increase in voltage as the cooling of the hot wire is greater.....on a map ECU this is probably why most import tuners are mucking around with the tune between drag runs. For a street car i'd go maf and for a race spec car i'd go map.