Pros: Fast movement. Hold a line after a few months. First year pay is the same, so you'll make more than your classmates that took the A320/737. Easy airplane to fly, simple systems. You'll get more flights, so getting to know the plane and the company will happen faster. If you want to sit short call reserve and not fly, 190 FO probably sees the fewest sick calls. Nearly everyone is on probation and doesn't have a sick bank yet.

Cons: Limited number of cities it flies to. There is a lot of BOS/LGA/DCA shuttle flying but there about a dozen other cities as well. Fewer planes/fewer lines/less options, but then again, you'd probably be on reserve on the 320/737.