It's hard to find slow all-flash storage these days.
I suggest to think about it this way: whichever you buy, it will be fast enough. But ONTAP gives you more options to manage your data and workloads.
If you had 1 or 2 high perf workloads, I'd probably suggest EF (lower cost of performance, given that your other requirements aren't many). But you have 5 different workloads, relatively many disks and VMs to manage. In that situation I think you'd benefit from the management features you will find on ONTAP.