I've never used an aggregator before. I didn't find Google Blog Search very helpful in finding my 3 blogs. It was frustrating. I hope to get better at using Google Blog Search by playing around with it some more.
I used Blogline's Top 1000 to find my blogs. You can easily preview a blog and add it on the spot to Bloglines or you can go back and look at other blogs. I found what I wanted pretty quickly.
I like using RSS feeds because you can have all of your blogs in one place with Bloglines. I also like RSS feeds because many give you information that is up to date. It's convenient that you can check your RSS feeds from any computer not just your own. It's like Delicious with bookmarks; instead you have RSS feeds with an aggregator.