As a part of an upcoming road race omnium, there is a "100-200m" straight sprint starting with a holder. Since this is more related to track racing, what type of wheels would you recommend? Deep dish(50mm TTish wheels), semi-aero 25mm rims, or light and fast accelerating wheels.
For any short full power standing start event I'd go with a disc wheel, which is the stiffest type you can get. They are a little bit heavier than a deep section sprint wheel with spokes, but not enough to have as much impact as flex. Aerodynamics are irrelevant here.
I second the light rims. Keirin racers in Japan use a wheel that has a light shallow tubular rim (like Araya), 36 spokes, and a high flange hub. Very stiff, very light.
Since its a standing start and a short race, you will only be going fast for a few seconds and won't take full advantage of an aero wheel. And you are not worried about saving energy, so a deep rim or a disc will be extra weight.