There is no impelling reason to use singles on a M blank (on a L they'd be 1st choice, however). That said, singles are a little lighter and inhibit flex less. They are also quicker to wrap/epoxy which is important for us lazy guys. They are more likely to bend or pull out if whacked, but I'm not very careful with my rods and have not had a problem (yet). I like them, but a lot of that is just visual rather than functional.
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