I would always suggest both are better, because if you get good links and if you have good content. I've used Blogspot for 2 years and it made my life joyful and will surely be a blessing to you too. Blogger is the best free Blogging Service available in Blogosphere if equipped with a good web hosting service.
- Blog description = 500 characters. HTML mark up not supported.
- Number of blogs = 100 blogs per account.
- Number of labels = 5,000 unique labels per blog, 20 unique labels per post
- Number of pictures = Up to 5 GB of free storage. Stored at Picasa.
- Number of posts = Unlimited.
- Static Pages = Limited to 20 stand-alone pages.
- Team members (those who can write to a blog) = 100 per blog.
- Size of pages = Individual pages (the main page of a blog or archive pages) are limited to 1 MB
- Size of photos = Photos are scaled to 1600px