Tools for library management?

[Mohmm]

Thanks to this thread I discovered Yate and Metadatics. Until now I did all metadata editing in iTunes, but their editing interface continues declining. Many things don't work as they should. Now I got trial copies of Yate and Metadatics but find both GUIs a bit complicated and not extremely well organized. Nevertheless I'll probably stay with one of them. 

Which of the two do you recommend in terms of stability and iTunes integration? Thanks.