Cisco Cat 9k series for our user net (not DNA) -- some questions

We are planning to buy 9300 series (with mGig and stacking) for L2 access and 9500 (StackWise Virtual ) as the routed aggregation layer for our offices. We are running: 802.1X, PoE for APs, NEAT for our 2960cx table switches, DHCP Snooping, and some other port security. We are aware of the problem with mGig and Cat5, so we are in the process of upgrading the cable infrastructure to CAT6A in the office.

I am still a bit worried about stability in the code of 16.x and the hardware itself. Currently we are running 3750x and in that deployment we have had some bugs in DHCP snooping and memory leaks with 802.1X. We do not wanna go back to those kind of headaches. We need 24/7 365 days of stability. As of now we are happy with the 3750x except their buffers.

. .

1.) Anyone of you guys that are running the 9000 series that can say anything about the stability in the hardware?

2.) Anyone that is running 16.x IOS XE that can say anything about its stability?

3.) Is it worth paying for the mGig ports? We are planning to run the switches for 7-8 years (or as long we have support on them). The switches are going to provide access for APs, and wired access to the researchers that demand high capacity user network. Is there any chance that we will see clients with support for mGig, or is this purely for APs?

4.) Running 9500 in StackWise Virtual -- is it buggy?

. .

We have a good budget, but we do not want to waste money unnecessary. We are not in a position to look outside Cisco products. We are going to have a meeting with our VAR, but I would like to get some honest answers before that!

Thanks!