As someone who lives in Lafayette and commutes to Youngsville, I would not live in Broussard/Youngsville and commute to Scott.
I go against the major flow of traffic to/from work. In the mornings the traffic on Youngsville highway coming to the Ambassador extension is terrible. Ambassador is terrible. Verot School Rd is terrible. East Broussard is terrible(though I heard they are going to do something about the intersection @ Kaliste Saloom soon).
Best areas are around Broadmoor/Woodvale/West Bayou/East Boyou as well as up to Dulles like a few have mentioned.
This post was edited on 4/24 at 9:44 pm