From my previous readings, since I don't own either...
It's important to note exactly which Xiaomi...
9 Pro is older of course, but probably still great.
If you referring to the Note 9T, then the main calling card for people if the fact that it has a huge battery and mainly its first locally launched model from Xiaomi that supports 5G.
If you mistakenly meaning the Redmi 9T, then that's a different model all together...
In terms of the Samsung, obviously the A32 is newer, and when it comes to Samsung, if you keeping it for awhile, I'd rather opt for the newer model.
Yep both myself and my son are happy Xiaomi Note 9 pro owners. Love the phone.
I only have two niggles with the phone,
I preferred the fingerprint sensor on my Redmi Note 8 pro (full finger) instead of the side button. It is no problem for my son but I suffer badly with Eczema and my note 8 pro could still pick up my fingerprint since it was a whole finger whereas I cannot use the fingerprint sensor on the side of the phone with my phone as it does not pick up my thumb print. the facial recognition works well to unlock the phone but for banking apps etc I now have to put in my passwords all the time.
then the next is just that the phone is slightly bigger than what I would like