On a PFL I personally like a side slip for shedding excess height. In the scenario given I would wish to land with full flap but I would be more happy doing the slip with intermediate flap to shed the height and selecting full flap before landing.
However, if I judged that I could get the job done by simply dropping full flap and not bothering with a side slip, all well and good. Equally, if I still needed a steeper approach I would be prepared to slip with full flap. To my mind, there is no single correct answer. It depends being familiar with the performance of your aircraft and responding to what you see out the window with some of that 'pilot
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