My favorite thing about Soalsa might be the UI. BG3 uses a hotbar system which might be ok for martial classes but spellcasters are going to fill those bars with spells quickly. Not to mention special weapon attacks, potions, scrolls, toggles like non-lethal, etc. They do have the tabs at the bottom that give you different hotbars for items, class features, etc and you can extend it upwards for more slots but that just blocks more of the screen, and you constantly have to open the character sheet to drag new spells, items, and such to the hotbar for each character. It's time consuming to have to set up your hotbars and always adjusting them throughout the game.
Solasta however did an amazing job with their D&D UI. The basic layout looks the same for any class. You have a button for Actions, Bonus Actions, Items, Class Features, Spells, and so on. Clicking any of those then expands to show the options. It makes for a consistent layout no matter what class you are playing and there is no need for you to spend time dragging every spell and ability to a hotbar slot for each character in the party. The UI just looks the same for every character without you having to do anything but at the same time is super easy to find what you want and to see what actions you still have available.
