I heard wordpress also is very trigger happy, and I know for a fact that yola likes deleting blogs as well. Why don't you just find 10 different candidates and give them all a try to find the one that's best for you? People will very rarely tell you what are working for them to avoid having them abused too much.
You're trying to rank them, that means you'll post high quality content. So, I'd recommend wordpress, hubpages and squidoo. They all rank well from my experience.
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