iOS/iPadOS 17.7.9 is, essentially, a security update. Insofar as documented or as assessed by researchers, there are no functional updates included in this update.
While it is perfectly true that iPadOS 17.7.7 caused significant issues - and was quickly suspended by Apple pending release of iPadOS 17.7.8 - thus far there have been no reports of issues with iPadOS 17.7.9.
If you have any concerns for the efficacy of this update, you might be well advised to wait for just a day-or-two before installing this update - while monitoring this ASC iPad forum for reported issues. Be mindful, however, that potential exploits for now documented security fixes are increasingly likely to be active over the coming days.
As such, you need to balance your caution in updating against increasing risk of exploit.