I always found that the problem with looking at time etc as a judge of ‘difficulty’ doesn’t really help you pick a course that would actually be enjoyable.
For example, the old Ironman Texas bike course was “harder” if you look at time/elevation etc, but it was WAY better as an experience. It was one big loop through mostly quiet roads and the national forest. Now you have to do multiple loops on a huge concrete highway. If you are riding 5,6,7+ hours then having some variety makes it so much easier mentally. IMO.