Best way St. Joe, MI to Orlando, Fl

[RoyalFrog2]

We've made this trip many times but it's Indpls to Atlanta that I wonder about:
Plan A: I-465 to I-65 Louisville to Nashville, I-24 Chattanooga to I-75
Plan B: I-465 to I-74 to I-275 Cincy to I-75.
Plan B appears to be slightly longer but overall maybe less mountains? Or?

[aceinspp]

I would go with plan A. This is the way we came back from the Frog Rally in Goshen, In. The biggest mountain climb is about 60 miles North of Chattanooga on 24. The other route there is a lot of construction in Cincy and lots of steep hills to Knoxville. We travel the route B route quite a bit going to MI near Romulus. Later RJD