I don't think one is better than the other, it's just a form factor. Just don't over pay for gimmicky things like "blade less" fans. It's a neat idea but not worth paying 100's for.
Any medium or heavy duty fans I've seen are round.
Tower fans are also round, but in a narrower column and vertical. I've never taken one apart to know for sure, but I'd think they're an enclosed squirrel cage.
The common box fan is kind of an outlier and may be shaped that way to fill space when sitting in an open window or to allow it to stand with less support.
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