Having been through two initials in the last twelve months they're not exactly rocket surgery. In both instances so long as you were willing to put in the work to study you're going to pass.

Regarding the 175 vs the CRJ, it's true, the 200s (and 145s) will be undergoing a long draw down over the next couple of years. The 700/900 will be with us for a while though. And Bombardier still has an order backlog for them, although certainly not as long as the backlog for the 175.

I can kinda see where you're coming from, but others are accurate in saying that there are others things that should be way more important in your decision making.