There are other options too you know…
Well Wocommerce is the go to place for most people I think if you’re on a WordPress platform as many find it through the plugin search. But like you said if you are a newbie it might be better to use Shopify.
However personally I find both platforms rather expensive though with rather horrible reviews on Trustpilot which tells something. It is always good to make a due diligence before you buy or try something and I think TrustPilot is good place to start.
But I guess since they are the most well know options that is what people use first?
But there are of course other options too for WordPress users:
https://wordpress.com/plugins?s=ecommerce which is in my opinion worth looking into too.