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Logs and branches are more likely to have support under them with the straight lines as opposed to a large circular design. Once one branch gets caught others are more likely to get caught up around it. With this design I think they’re more likely to clog on the outside. This one looks like it would be easier/safer to clear debris.
Imagine having to deal with [this](http://twistedsifter.sifter.netdna-cdn.com/wp-content/uploads/2010/05/morning-glory-plughole-spillway.jpg) instead.