I use joomla for my websites but there is not a good commenting component for joomla ( i used jcomment but i don't like it). my last website is a blogging site for an ecommerce site, so i decide to use k2 for its blog section but last release of k2 is for last year.
my 2 reasons for using k2 over joomla's core articles are 1: built-in commenting system, 2: overriding layouts in k2 is simpler than joomla.
now i sould use joomla's core articles for blogging or k2? or even i should switch to wordpress (i didn't use wp before)?
If the sole purpose of your website is blogging, then you should move to wordpress. Wordpress is easy so you should not have any major problem. Watch a few youtube videos and you will be able to get started.
Make sure you enable akismet spam protection for wordpress.