I would prefer blogspot instead of wordpress. There are many reason behind it some them are as follows : First of all its google product, 2nd is blog gives a lot to freedom to change the theam free without installing any plugins unlike wordpress.
Both are good. But if you are thinking of blogging profession (i.e., if you are wanting to become a pro-blogger), if recommended that you start your blog on WordPress self hosted platform. However, if you're just blogging for fun and sharing stuff with friends and family, Blogspot is a good way. Just as Chris Brogan says "The only difference between blogger and pro blogger is that a “pro blogger” has quit their day job because their blog now pays for their livelihood.", so to become a pro blogger, blogging on a self hosted platform like WordPress is really necessary.
My votes go to wordpress, because it is more customizable compare to blogger and it has some more features than blogger.
Which do you prefer and why? Blogspot vs. Wordpress? I might start a blog and am wondering which one is better- blogspot or wordpress.
Blogspot has better seo techniques compared to wordpress. As blogspot is google that means that your blog is much easier to be found during search results