No quibble with Nathan's comments; they're spot on. I would recommend choosing a platform that has a community of developers you can turn to in a pinch. In addition to WorPress, I've worked several other popular systems:

The Hubspot CMS/sitebuilder does most of what you're asking about EXCEPT the online store, and its lead capture is the best integrated solution I've come across.

Joomla is powerful and easy for the beginner/intermediate, but its most popular and "full featured" e-commerce add-on (VirtueMart) is a nightmare.

Drupal requires a far more advanced skillset, not for beginners or the cash poor.

Magento is an excellent e-commerce / content management system with a great developer community.

A hybrid is also an option. For example, you could create matching templates for WordPress and Magento, and install them using separate subdomains or subdirectories. Visitors don't have to know they are switching between platforms.

The one you can use.

You need to find the tool that matches your skillset. I use basic tools and mostly avoid the templated fill-in-the-blank forms of web builder. For quick and dirty work, Wordpress installations get me pretty much everything I want in a fast tool and most of my sites actually use wordpress these days, just because it's so flexible and has such a rich community.

That richness adds a complexity that some people can't handle.

Pick one that makes sense to you and use that. "Best" is relative.