One speed vs Two speed gearboxes

[metalthorn]

My team is trying to decide whether we want to go with a two speed gearbox or one speed gearbox. For the last two years we have been running 2 speed gearboxes, this year our mentors are talking about possibly shifting(no pun intended) to a one speed. The main argument for the two speed is the flexibility it offers. The main argument against it is that they are expensive and they may not be worth the price. We are discussing this now among the team but I want some other perspectives on the issue.