Best solution for POD?

Which is the best integration platform for Printful when you want to create your own e-commerce site on your domain? is siteground/woocommerce good or is there sth better?

If you are able to run some basic sysadmin highly recommend you to go with AWS or Digital Ocean. In case that's not an option then you are better off with WP Engine. I have used them in the past and no complaints whatsoever against them.