Never used VMWare, but ran OpenStack in my lab ~6 years ago. It’s an awesome bit of tech, but the thing to keep in mind is it very much isn’t a “product” like VMWare. It’s a big pile of python code and config files that mostly kinda sorta work out of the box, but is really aimed at large operators who have full time on staff developers to write custom bits to glue stuff together to make it work with their particular setup