Their biggest weakness is that every voice has a persistent synthy quality, like it's a vocaloid it's being sung into one of those tinny microphone toys for kids. I find Udio has much more natural-sounding vocals.
Udio has these random "halfway" singer voices that I find really interesting to listen to - a little uncanny-valleyish sometimes but interesting nonetheless. Depending on genre it can be a Nat-Sinatra, a Whitney-Dion, etc., it's really cool. It would be great if it could be saved from a song then loaded back for a new one on demand.
