I am moving my site off of Squarespace onto Wordpress.

The site on Squarespace is slow, and I cannot change what I need to, to make it fast. Google penalizes this. Bing is also reporting issues crawling it.

Also like you said it is not standard to integrate bitcoin payments.

In the end it matters what you want to do with your website, but if you are planning on growing, I'd look hard at limitations you may encounter.