I bought M6 but not sure if M9 or others would be better to use. Checked all sorts of online forum and comparison and looks like M6 has the most and best feedback.
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I don’t have either but have heard great things about both!
I have the M6 and it’s currently my favorite pump so far. I have the M5 too
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I’m about to get the m5 but the m6 looks like a great pump. That’s just based off what others have said though
I use the m6, and love it! I like the simplicity of it. It’s still going strong 16 months in! It would work even better if I got a new diaphragm and duckbill. I’ve actually never changed them out!