Yes, HubSpot is a very visual CMS where you are essentially editing on the fly with a visual representation on the right via their visual editor and additional logic & functionality tucked to the left. 

It can be excellent for your marketing website as long as your have marketing hub Stater or Professional and or their Content Hub.You can tie in the campaign reporting and planning tool within HubSpot to assign website pages to your campaign as well. 

It depends. A couple of foundational thoughts are to consider if your marketing and or sales hub stack is in HubSpot and your website is primarily a marketing site without heavy custom web development needs, then HubSpot CMS can be a great move to build your site within.

With HubSpot’s campaign tool, you can assign any website pages that are part of a campaign you are managing directly to that campaign.  From landing pages to website pages, you’ll have better intel per campaign.

With website personalization within HubSpot, you can tailor your website pages to show specific information to certain visitors. You can use personalization tokens to display your visitors personal names and more or keep it segmented more based on where they are coming from or where they are in their buyer’s journey..