For a small professional-services firm, the site often needs to do a few things well: explain the services, establish credibility, answer buying questions and make contact easy. A good decision begins with those tasks, not the longest feature list.
Wix, WordPress and Squarespace offer different ways to create and operate a website. All require someone to decide what it says and keep it useful. Before choosing, name that person or provider. An editor cannot supply knowledge of your business by itself.
If your main need is ecommerce, a membership operation or a complex application, compare those functional requirements directly. They are a different project from a small informational presence.
