Debian 9 vs Ubuntu 18

[Jim]

I've been using Kubuntu for 5 years now since I freed my computer from 
windows and started running linux.  For most of that time I used Kubuntu 
14.  I tried 16, but soon gave up on it because there were too many 
bugs.  In July I put Kubuntu 18 on this machine. There are some annoying 
bugs with it, but nothing that keeps me from using it.

I saw on here recently that someone said they use the stable branch of 
Debian.  I'm looking for some advice.  Should I stay with Kubuntu or 
switch to Debian 9 stable?  If you have an opinion, please tell why you 
favor one over the other.

Thanks