At the risk of making a few enemies, lol, take it from a team that has played both: CC is the better/tougher opponent, and not really close. No one saw this coming from them, but it is what is.
And as someone who has watched every ISU game for several years, the ISU team that LA beat would've lost every game on it's schedule this year save for Kansas. It was the worst I've seen a Matt Campbell team play other than maybe barely beating non-scholarship Drake in a mudhole a couple of years ago. That includes year 1 when ISU lost to the likes of Northern Iowa. It was the least disciplined any ISU team has looked since the Gene Chizik era. Kickoff coverage and punt coverage looked like they grabbed 11 random guys from campus 15 minutes before the game and told them to go cover kicks.
With that said, Louisiana was clearly the better and more prepared team that day. Sometimes you just whipped, and it was one of those days for ISU.
And Coastal is a very good team. Maybe they are better than ISU, maybe they aren't. Either way I hope the Cajuns throttle them.