From personal experience, I would say Meizu. I've been extremely satisfied with mine. It's easy to use and easy to load. Just drag and drop. Plus, I'm satisfied with the video playback. Sound quality is excellent and battery life is amazing. The touchpad takes a little getting used to, but works great once you get a feel for it.
I would not choose an iPod because of iTunes. I'm not necessarily against Apple products, but I don't like the fact that you have to use iTunes to get music or videos onto your player.
Don't have any experience with the Zen so I can't really offer an opinion. I would say that the Meizu and Zen screens are the same size.
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