The Corsa is aluminum, making it useful only for occasional snow travel during the summer.
The Raven Pro is a lightweight axe, in the style of a typical mountaineer's tool, sufficient for all conditions of snow/ice/glacier.
With that said though, the Raven has a better pick for self-arrest. IMO, the Raven Pro isn't as good a mountaineering axe as the Raven.
Length is, to a degree, a personal thing. The standard these days is easy enough to measure. Pick up and axe, and gently hold the head in one hand, letting the spike end droop near the ground. With your arms comfortable relaxed at your side, the tip of the spike should come to your ankle. For gentler walk-ups and hiking-oriented travel, a bit longer length is recommended.