Which ppa for kde?

[Nigel Ridley]

Kubuntu 11.0
I'm having a few issues with KDE 4.7.2 and was thinking about adding the ppa for KDE 4.7.3
I don't want to mess up my system but would like the advantages of a more reliable KDE.

Which ppa is recommended:
Kubuntu Backports [https://launchpad.net/~kubuntu-ppa/+archive/backports]
or
Kubuntu Updates [https://launchpad.net/~kubuntu-ppa/+archive/ppa]?

TIA,

Nigel