Help with automating tasks. SecureCRT vbs not cutting it.

Hey all, been reading through a lot of posts and can't seem to land on a decision for my scenario. We have a lot of equipment that comes back to us where we need to completely factory default and then bring code up to par at the same time. As an example we have a Cisco 3850 and need to renumber the switch and priority (pulled from a stack) which requires reboot then after reboot we need to upgrade software and run diagnostics and a bunch of show commands that would dump to a file. We automated a lot but it's all using SecureCRT vbs scripts we recorded. We then review by reading the output for any errors or issues manually. I want to automate this by 1) running all of this with like a drop down for model and chassis type and code version that pulls from a nas from a web interface. Then 2) I want an output file read for any errors or issues and notify us via email. If no errors we get email with output we can save for later viewing of needed as well.

Any recommendations on what would work best for this?

We do this on Juniper, Cisco, and some Arista but mostly Cisco.