Just did some quick tests cause I saw someone complaining about archers vs. crossbowmen.
Did all tests on grassy plain in clear weather against Papal Guard. Always placed missle units 3 rows deep (don't know if that matters).

1. Retinue Longbowmen(90) - missle 8
1 minute = 5 volleys and 17 kills
1 minute = 5 volleys and 16 kills

2. Aventurier(90) - missle 14
1 minute = 3 volleys and 12 kills
1 minute = 3 volleys and 13 kills

3. Janissary Musketeers - missle 17
1 minute = 4 volleys and 38 kills
1 minute = 4 volleys and 37 kills


I don't know if I missed anything on the test.