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Examine the below two URLs: yoursite.blogspot.com www.yoursite.com Both sites start off with the same value from a SEO perspective. They have no inherent value and any PR needs to be built from scratch. The advantage of the yoursite.com is you own the domain. You can create subdomains and use the domain for life. With a blogspot.com subdomain, you are using the sub-domain under specific terms, and you could lose the subdomain if those terms are violated. There are a few instances of angry people who had built up their blogspot.com subdomains over a period of many years and then had their site taken away from them. Generally speaking, you should create your own domain.