Full disclosure, I used to work there but Axial provides a great platform for identifying relevant m&a advisors. With their platform, you can view a number of qualified bankers/advisors, see their prior experience and determine who would be the best fit for your business.

My recommendation would be to develop a list of 5-10 bankers, interview them and decide who you feel most comfortable with.

The process you choose to find the right partner is almost as important as the m&a process itself.