To select a suitable virtualization company, it is first necessary to understand your needs. Then, just list your business and technical requirements and create a document, for example, RFP (request for proposal), that lists the vendor selection criteria and then compares IT vendors according to them.
In the next phase, you may select 3-5 virtualization companies from platforms like Clutch by applying the necessary filters by region, expertise, rates, etc. It is possible to shortlist these companies by studying their presence online, a website describing their expertise, portfolio, former clients, and similar metrics.
Furthermore, you can start contacting companies one by one and ask questions about their virtualization services provision. You should check the team’s qualifications, certifications, technologies, and approaches. Check how the company covers security matters and how they keep data secure. As well, check out agreements or other documentation like SLA that support the company's work.
Finally, it is even more important to pay attention to communication, transparency of the processes, and their ability to share information and add value to the proposed solution. Going the extra mile is a vital sign when selecting an excellent company for virtualization services.