Why Do My Google Blogger Sites Rank Lower Than ISP-hosted Sites in Alexa.com?

I asked the following on a guest post by Chuck Rylant on ProBlogger.net, expecting to get some concrete answers to low Alexa.com ranking for my other websites. Just like Chuck, I personally think it’s because of the SEO tools available on self-installed WordPress websites that may not be available on Google’s Blogger. I am re-posting it here because I didn’t get the answer I was looking for and am hoping someone can help me out.

Here is the comment I made below, also linked here Guest Post by Chuck Rylant

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11/4/2011 at 1:26 am

I am also not a professional blogger and average around 2-3 posts a month on my computer blog //www.aminsolutions.com and post more frequently on my personal weblog //www.chromiloamin.com. I also use Alexa to see my progress but am currently stuck at 5 million on Alexa for the computer blog and 23 million for the personal weblog. It’s been at 23 million for a long time and won’t budge. I thought post frequency would improve my ranking. Is it because I use Google’s Blogger for the personal weblog while I use WordPress for the computer blog? I am thinking of porting my weblog to WordPress. Did you determine if this played any role at all in your research and roadmap? I am also trying to promote an e-book //www.aminsolutions.com/book and am using these blogs for my platform.

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Do you know if there is a difference in the way Google Blogger websites rank in Alexa.com compared to ISP hosted websites?