> Depending on how your configure your LEDs, one advantage of
> multiplexing could be a power saving as only one LED's on at a
> time; perhaps useful if your gizmo is going to be battery powered

Yes, that can be true. It's also true though that with row and column
strobing more than one LED can be lit if required. As would be the
case with direct drive

My primary reason for favouring direct drive over multiplexing in this
case is so that the micro speed can be reduced for that part of the
project. I'm still weighing up options such as SLEEP, WDT, T1OSC
and internal speed switching (INT0 and incoming data processing
at high speed, back to low speed afterwards for example)

Thanks

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