So I haven’t touched bahamut, Alexander, or omega. I assume the regular 8 mans are about on par with the hard mode trials? I assume they’re intended to pug rather than static. I enjoyed the HW alliance raid. Somehow missed it before. Easy as shit, but at least the first boss made me feel like an idiot not reading it. Missed that feeling.
Raids are slightly harder than the early story trials, but about the same as the story trials later on, the ARR/HW trials were kinda designed to be super simple but as they add more mechanics to them they get more in line with normal raids. You can queue in DF for them and most boil down to "dodge shit" or "do the one mechanic", and you can either look it up, ask someone in chat or just try to guess/die and it won't matter. They have pretty cool stories too that are touched upon or directly linked into the main story later on.
Exceptions as noted is Coils of Bahamut, in ARR they didn't have normal/savage, they did savage as an experiment only for 2nd coil, and so the normal difficulty raids are "savage" difficulty, kinda, but since they're old they're not really as hard as any current savage, but much harder than normal raid. Something like Extreme trials difficulty or so. Because of this you can't DF queue these, unlike the others, so you either get carried, or solo them once you're high lvl enough.
The story for Coils of Bahamut is very cool so definitely worth doing, but I'd recommend either getting a friend to carry or doing it yourself, so you can go at your own pace and watch the cutscenes and stuff. I think all of it can be soloed, although for some you have to do weird shit(like coil 7 or 8 or whatever, both parties have to step on buttons to open the path for the other party, so you have to recall and go back to the entrance and take the other route and such). With modern ilvls I assume any class can solo everything, but tanks tend to be the easiest. Blue mage will also shit all over that stuff, can one shot most bosses(although you don't get to see the mechanics and stuff which for some fights sucks, Bahamut is a lot cooler going through the phases and seeing the music changes as the fight gets crazier).