I've had both and they had a pretty similar fit. Ion is a slightly stiffer flex that would probably be better with your Malolo in pow. I did like the grippier Vibram outsole on the Imperial though. The $100+ price difference between the two would prob play a factor in the decision-making process for most peeps though.
16 NS West . 15 NS Snowtrooper BIA . 13 Salomon Pow Snake
15 Now Drive . 14 Burton Genesis
14 Flow Hylite