T H E D I S P L A Y I find the Disqus commenting system much more aesthetically pleasing than Blogger's. I love the colour scheme, size of photos and general fonts that fit well with almost every blog I've seen. If I'm being nit-picky, Disqus also has less spacing than Blogger. This is not a major issue for me but I do think it looks much better.
E D I T I N G For me, editing is a major plus for moving to Disqus. How many times have you posted a comment then checked back a while later to realize that you've spelt something wrong or missed a word out of a sentence so your reply makes no sense? With Disqus, you can edit your comments after you publish them - no more silly mistakes and yay to being a little more professional!
R E P L I E S Above all of the points I've mentioned in this post, the main reason I switched was to make replying and follow-up comments easier to tackle. I've found that once I've commented on a blog using the Blogger comment form, I have to remember to check back a few days later to see if they've replied. With Disqus comes a notification system in which you get an update once you've gotten a reply. Genius, right?
I think I can safely say that Disqus is my new love and I'm ditching the Blogger comment form. What do you think? Which do you prefer?