Both are great games! Bastion is a more traditional action RPG where you obtain new weapons and powerups that allow you to take on increasingly more difficult challenges. But it has a beginning, middle, and end. The music (like Hades) is phenomenal and (also like Hades) the game is known for it's seemingly procedurally generated voice acting. For example, you can smash up a bunch of barrels and the narrator will say something like "the kid just kept smashing barrels, I'm not sure what exactly he was looking for." This kind of stuff was mind-blowing back when the game first released in 2011 - like, the game obviously wouldn't have said that if you didn't do the thing, but they obviously also recorded the voice actor saying those lines in case you did. Bastion's got a lot of surprising moments like that, it's kind of the game's claim to fame.
Transistor is also an action RPG but kind of turns turn-based. Think more like Fallout 3's VATS system - you can queue up multiple moves to execute in succession - and the higher you level up particular moves the more interesting ways they can interact with each other. Or you can skip that part all together and just button mash, but you're going to run into issues unless you're amazingly good.
However, the story of both of these games (although excellent) is nowhere near as rich as that of Hades. There are very few character interactions and the stories themselves are more of a "show don't tell" nature, especially Transistor. Not to say they're bad, just that Bastion only has (I believe) a total of four characters and all but one of them play a really minor part in the story. Transistor has like... two characters... kinda... but really just one. Meanwhile in Hades you have a huge cast of characters (30 or so!) that all have really unique personalities and traits. But - don't let that dissuade you, because both of their earliest games are also really great. They also regularly go on sale on the Switch for like 80% or 90% off.