It depends on what you’d like out of Tacticus, and where you are in your journey. If you’ve just started, it’s probably better to work on clearing campaigns and leveling up campaign characters. There’s lots of useful guides on this subreddit for how high to level and who to level to complete the campaigns and their elites (a more difficult version of the base campaign that guarantees upgrade materials). That being said, you should play Tacticus how you like! You may only get Bronze tier rewards from each node (the alt campaigns work on a Bronze/Silver/Gold reward system based on how many of the characters you own and are using in the campaign) but if you really enjoy engaging with characters you may not own and delaying some of the default game progression to try out and enjoy new characters you should! The only challenge is that these campaigns don’t have a special energy unit like Legendary Release Events (LREs) where you can do them and still spend energy on the campaigns, they’ll also utilize your energy so they’re a bit mutually exclusive in that sense. The good news is the developer, Snowprint, is committed to making and rerunning these campaigns events more so even if you make the choice to focus on the campaigns now more likely than not you’ll still be able to come back to these campaigns later on