Wordpress 1,000% (probably coupled with WooCommerce but there are probably some other options)
I honestly don’t even know off the top of my head why you would use anything else (aside from some vague elitism connected to the large ecosystem of commercial crap which has tainted by association the open source core of it) – it combines FOSS + easy + powerful + popular. You will have to tiptoe around some amount of crapware in order to keep it pure OSS though.