We have both rods (in various sizes) and 1010 rails at both mid-power and high power pads. The way how we have it setup, fliers can swap them out easily and quickly to match what they have on the rocket. Said that, there is a clear trend towards buttons/rails both for mid-power and high power, so you are less likely to have to swap out rod for a rail than rail for a rod on your assigned pad. When possible, you'll be assigned to a pad that already has what you need on it. But if there isn't one, you won't have to wait, you'll get assigned to any of the free pads and you'll simply swap out whatever is currently on the pad to whatever matches your rocket.