What version of ESXI do you recommend for new servers?

What version of ESXI do you recommend for new HP ML350 Gen 9 servers?
We plan to create a DC with server 2016 and another instance with server 2016 for teh SQL instance.
We need to create 2x virtual instances VM, one for the domain controller and another for SQL services.
We had ESX5 running before but we having issues with drivers when trying to load.
Is this software still free? It looks like version 6 is chargeable.
Thanks in advance.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:

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unrealone1Author Commented:
Brilliant! This is why experts exchange is so great.
Thank you for answering that.
unrealone1Author Commented:
Thanks to Andrew for a swift answer and off I go to get the solution.
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
no problems, make sure you update HPE server firmware!
Lee W, MVPTechnology and Business Process AdvisorCommented:
There's nothing wrong with VMware... but Hyper-V is built in and from a performance and reliability standpoint, it's on par with VMWare.
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