Ironman Arizona is a great event and it often has some really good competition at the top of the fastest age groups. However for those in the middle of swim bell curve it can get really congested on the mostly flat bike course, which takes away from your bike strength.
I think Louisville is potentially good course for this venture. Hilly bike where there are fewer draft packs/better chance for good cyclists to shine. Followed by a flat run course which won’t beat your legs up as bad. Downtown Louisville has a great high energy finish line too.