Gloomhaven is my favorite board game, period. With that in mind, I'm notably biased in multiple directions.
Obviously, I think any form of playing Gloomhaven is going to be a good time. For instance, if you have a BG3 group or some other group of friends that wants to meet regularly to play a game, Gloomhaven is a great choice. I think the character progression mechanics are really fun to engage with, there's a shocking amount of content, unlocking new things is satisfying, etc.

The other part of my bias is that, frankly, I am always going to prefer the board game. Nothing in this beats the physical aspect for me. Personally unboxing new characters and pulling out their figurine for the first time, putting stickers on the map, opening envelopes, all while sitting at a table with your friends, that can't really be beat by a digital version in my eyes. The digital version is significantly faster both in play and in setup, and that's the only positive I can give it over the original.

Still, I'd recommend this game to anyone who enjoys turn-based tactical RPGs, board-game fan or not.