fvtt-dndbeyond-character-sheet VS fvtt-ready-set-roll-5e

There's also the full DNDBeyond character sheet module as well as the compact one if you want that style.

If they're used to DnD Beyond, then you might be able to kill two birds (character sheet and rolling) with one stone by using the Beyond20 browser add-on (though it might need some tech savvy to install). I don't use it (nor DND Beyond) personally, but it should let them make rolls right from their DnD Beyond character sheets. Or if you'd prefer to keep things contained within Foundry, there's also a DND Beyond Character Sheet for 5E which should look a lot closer to what they already use.

If accessing the monster actions is the problem you might try the Argon HUD or change the default sheet layout to something like the dndbeyond character sheet module or monster blocks so it's more familiar

I did find this module, which attempts to recreate the look of the dndbeyond sheet but has some clear differences, so there's a bit of precedent for it, but I just want to make sure I handle this properly.

The two best ones for this are Midi QoL and also Ready Set Roll. Speaking of, I should add that one to the list since it’s really useful, even if I don’t personally use it and it’s not compatible with Midi.

For simpler rolling, I personally like the Ready Set Roll module, but that's largely because I'm used to the Roll20 roll templates that include two rolls side by side in case of dis/advantage accompanied by damage and an extra critical damage section if either roll is a 20. It really streamlines combat for me, because I find the amount of clicking necessary to display the same information in DND5E for Foundry very frustrating.

Ready Set Roll for 5E - https://github.com/MangoFVTT/fvtt-ready-set-roll-5e