Wordpress by default allows commenting on pages, any page. Even if you turn commenting off for a page bots can still access the commenting endpoint; even if you use a 3rd party commenting system such as Disqus. Wordpress comes with an anti-spam filter called Askimet which does a pretty good job but
Tumblr supports responsive design for the website as it will be fitted with the same theme based on which device the user is using to view the website. It can also vary by theme with responsive design availability.