Dofollow blog commenting gives dofollow backlinks that passes page rank (PR) value to your preferred URL. The higher page’s page rank, the better your chances to get good PR in next update. This is part of your link building activity that concentrate on google search engine and its ranking system (PR).
nofollow link do not help in PR since they dont give you PR juice. Only dofollow link will help on increasing your PR
Yes, dofollow links are better but don't be a fool; comment and post your links on nofollow sites too, or it will look weird.
Yes, dofollow link is good to increase pagerank. Google Page Rank of a website is to estimate the value of that particular site when buying/selling links.If the other webmasters give us a backlink with “dofollow†tag included, then we get some share in their pagerank i.e., the link will be considered by Google and our site ranking improves. Whereas if the other site owners give a link back to our site using the “nofollow†attribute, then it will not be considered by Google and our website ranking will stay same as it is.
getting a mix of both is good, because if you have concentrated on dofollow and Google decide tomorrow to include nofollow you will lose out.
Agree. Dofollow links do pass PR juice however when gathering backlinks consider also its relevancy to your site.
dofollow links help in gaining PR however, having no or very few nofollow backlink won't look natural to Google which is never good...
Obviously do follow link is better than no follow link because do follow links share their PR juice with other link and give back link to us. On other hand no follow link does not share PR juice only give back links sometimes.