I have both shopify and woocommerce (although woocommerce is very low active right now). I like shopify's layout and it is easier to set up than woocommerce (I took some udemy courses to set up shopify).

I am paying $27 a month for shopify and that's all the cost right now. I am also planning to create another ecommerce and this time using WA methods (writing a lot of articles with keywords to enhance SEO) and debating which one I should go. Shopify's blog is sort of too simple you can't really have any category, so that's something I am pondering. If you have only one category to write about, then you can just keep adding the blog post, but I don't know how much that would help SEO.

Just one thing, shopify loves mailchimp, so if you decide to go for shopify, make sure to use it. Mailchimp is free so it should be no problem. :)

Shopify is good for e commerce and easy to set up, but it is getting a bit expensive after a while as everything you add will cost money.
Woo Commerce is a bit more difficult to set up but works the same way it is a great way especially when you have your own products.
Not so sure you are familiar with Woo Commerce but Chris had a great training on it. It has multiple parts
Online Store With WooCommerce Pt.1

I don't have any experience with an ecommerce store but do know that WordPress has WooCommerce. You might start by comparing this to Shopify. And with SiteRubix it is very simple to set your websites up here.