A lot will depend on the pedals. I ride grippy flat pedals on my trail bike, clips on my XC bike and non-grippy flats on my commuter. The grippy flats allow the least freedom of movement whilst pedalling and standing, once I have got my foot in a position it stays there. There is more rotational play in the clips, and on the non-grippy flats my foot moves all over the place, but I can only generate power by pushing on the pedal, there is no kick and scoop over the top and bottom of the pedal stroke.
The commuter has Shimano trekking pedals with a clip one side and the non-grippy cage the other, so with a pair of them that is two options to try out.