At the same time it turned from “tap to listen, here you go” to a sluggish af and ads-infested bloatware. I remember when I stopped using it and deleted the app because my prev-gen iphone couldn’t load it in time anyway.
What Soundhound does these days that Shazam doesn't (I think; I haven't actually tried Shazam in a long time) is that it displays lyrics for many songs, and is often able to synchronize those lyrics with where you are in the song.
I'd argue that Shazam doesn't have ads, rather it is an ad. You search for the song, then see links to buy it in Apple Music. You'll also see "subscribe to Apple Music" type widgets on just about every screen on the app.