For ecommerce wordpress is deal with so many updated plugin which help you to get better results through seo
I suggest you to use wordpress

If you are newbie for for e-commerce and don't like very much of customization then I highly recommend going with WordPress.

But if you are coding nerd and like to modify deeply things then you could go with HTML. Probably you will need also to learn PHP if you are after modification of your website or a blog.

The easiest option if you want to build an ecommerce website is Wordpress. Wordpress has huge collection of ecommerce themes and plugins that you can use and activate in your website which enables you to easily configure your website and add your products.

On the other hand, if you want a customize ecommerce site solution when you define your own function and style then you can do from scratch using html, php, database either mysql or postgresql. Or you could use frameworks like Code igniter.

Another option would be to use free shopping carts like Zencart, OsCommerce and Cubecart.

Check out Shopify, it's designed specifically for e-commerce.

I mean WordPress is a CMS and HTML is a markup language. it’s like comparing apples and oranges.

HTML is common language, if you want to use WP, you need to know HTML. Learn both HTML and WP is best choice