There are hundreds of comparison article for WooCommerce and Shopify
But for a newbie, Shopify is very easy to use and user friendly but if you are looking for complete customization options then you should use WooCommerce.
Also, WooCommerce is more SEO friendly than Shopify, WooCommerce stores can easily rank on Google as compare to Shopify.
If anyone of you need any help regarding your first online store, feel free to ask me.