Any website platform can rank if Google can read it, but you need dedicated SEO fields for meta data and titles. Wix offers some, but Squarespace lacks the essential fields you need to do real SEO work.
Is Wix good for SEO? Maybe yes, maybe no. Here's the reality: any website that has the ability to communicate with Google can work for SEO. The key to figuring this out is understanding if that website has SEO fields available to it, and they don't all have that. So if you are a DIYer and you want to build your own website on Wix, good for you. Like, that's really awesome. And double-check what is available for SEO before you invest your time in this with the expectation that you can grow your SEO, because the answer isn't always clear. You have to be able to communicate with Google. Google is going to read all the words on the page, it's going to read all the backend information, but if you don't have fields filled in, that's on you if the fields are available. But if the fields are not available, as you often find in places like Squarespace, well then you're never going to be able to communicate the way you want to with Google, and an SEO project doesn't really make a lot of sense.
