I now usually test if a song works better with one or another AI music sites. And now Suno usually is the worst (I don't bother with Riffusion, Choruz.ai or even the horrible mureka.ai anymore) and it's often a tie between Udio and Sonauto. Some genres just work better with the one or the other or in rare cases (mostly classical/orchestral stuff) Suno is better.

For this song and in a very specific style about the 1920's serial killer Fritz Haarmann Udio had by far the best result, with Sonauto pretty much failing and giving me some vintage US music with female vocalists, despite explicitly prompting for a male vocalist and a complete different style. And the results for Suno were absolutely atrocious.