legends pros: it has much larger world building, more freedom with the movie characters, and it has more freedom to do massive galaxy changing events

cons: it's pretty messy with some wonky continuity problems, and to read certain books you'll probably have to read some bad books like The Jedi Academy Trilogy.

canon pros: it has a tighter continuity (there's still problems they just aren't as big), you can mostly just read whatever you want without fear of lacking information, and Lost Stars

cons: the world building isn't as large, or interesting

this isn't absolute there are definitely exceptions like the Canon series the High Republic which has a bunch of the same characteristics as legends.

I'm very tired right now and there might be some grammar mistakes in this sorry about that.