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Why you Prefer WordPress over BlogSpot?
Best answer will one single site license of SEOPressor plugin (Worth $47)
You can read complete review here:
Tahir Siddiqui's profile photoKulwinder Singh's profile photoGurwinder Singh Bhinder's profile photoHarsh Agrawal's profile photo
It look more professional (WordPress) then blogspot. You can handle categories with ease as compared to blogspot,and most important Seo for WordPress is easy.
1. BlogSpot keeps you behind the bars by not giving access to server files while WordPress gives you free hands.

2. WordPress is much more flexible and easy to customize, even if you are not good in customization, there are vast availability of themes.

3. You can not sell your BlogSpot blog while you can do so with your WordPress blog.

4. Last but not the least - WordPress gives you free hands to optimize your blog for SEO.
Vivek R
If you ever used WordPress the I think there is no reason you will compare both...Blogger is good for beginners but It wont get you much audience.

Selfhosted WordPress is the best ever tool available for blogging...You can easily customize your website with thousands of Free Themes and Premium themes.

Literally you will get plugins for every functionality and you dont need to run behind a coder to get things done.

From my opinion WordPress saves me lot of Time which I think much precious than any other thing.

Lastly WordPress is a OpenSource blogging platform where as blogger is a proprietary which is managed by Google.
I Prefer WordPress over BlogSpot as the variety of themes in Wordpress is larger, better and themes also dont look cluttered. Wordpress Blogs never go dead. Main advantages are the plugins, pings etc. :)

-I was and am always in support
of WordPress.
Wordpress is very popular and useful CMS and I prefer Wordpress over Blogspot because Wordpress has a Large list of Plugins which makes it easy to handle blog. 

Wordpress is not SEO friendly, but we can make it more SEO friendly by applying some tips and methods, Blogspot doesn't any useful plugin for any work.

You should use Wordpress if you want to start a blog for affiliate marketing, you manage affiliate links on Blogspot and your blog may get hit by Google.

You can use advance plugins to optimize your blog and posts for search engines on Wordpress. Plugins like SEO by Yoast, SEO Pressor are useful to optimize blogs and posts and You can also optimize Images automatically in Wordpress. These features are not offered by Blogspot.

On blogger you have to add widgets yourself and you have to add some codes in the widget too, but on Wordpress you just have Drag-Drop the Plugin and Do the ordinary settings.

If you talk about the themes it is very easy to customize the themes in Blogspot you just need the knowledge of CSS and HTML, you can't customize themes in Wordpress without the proper knowledge of PHP. But Frameworks like Genesis and Thesis offer these features.

The last but not least reason is that you can manage your Data very easily on Wordpress and no can delete your data, but Blogspot doesn't offer that much features to manage Data and Google can delete your Data if they find any reason.

These are the few reasons for which I prefer Wordpres over Blogger and have moved my blog from Blogger to Wordpress.
1. Control Over Blog
This is one of the major advantage of self hosted WordPress blog. You have a full control over your blog as compared to Blogger blog. As blogger is owned by Google, it may drop it anytime without any notice and we have seen many cases like this which you can search on Google. Moreover, in case of Blogger if the blog gets hacked then there is no way to recover it but in case of WordPress you can use the backup from your server or host to restore your blog.

2. Search Engine Optimization
WordPress allows you many options to optimize your blog easily for better SEO as compared to blogger. I feel that from SEO point of view WordPress is better than Blogger way ahead due to vast number of plugins and features available in WordPress.

3. Customization & Flexibility
 The vast number of plugins and themes on WordPress make it very easy to use and customize.WordPress offers you a range of helpful plugins to choose from which is not possible in case of Blogger. Many premium plugins available on WordPress really allow your blog and provides it with new and life where as on Blogger you have to do and check everything manually.
Thanks everyone for their answer, and it was tough to decide the winner. 
Congratulations +Kulwinder Singh  For winning the contest..

+Kulwinder Singh  Kindly mail me at admin[at], with your domain name, where you want to activate SEOpressor plugin. 
We will have more contest coming up. One contest is live here:
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