There may be some confusion here. There used to be a specific OrCAD layout package, but that's long since been discontinued.
The tool now sold as "OrCAD PCB Designer" is Allegro. Or at least, it's the exact same executable, but with a restricted set of features controlled by a licence file.
For what it's worth:
- I've been using OrCAD for schematic capture getting on for nearly 20 years. It's evolved remarkably little in that time, but then again, it really didn't need to. It ticks the "just works" box for me.
- The layout package isn't modern or friendly. To get into it, you'll first need to accept, on a deep and fundamental level, that you are going to use it, and that you will be able to learn and adapt much quicker than it will ever change. If your way of thinking is often along the lines of "this is wrong, it should be designed so that <whatever>", then you're not going to get on.
- Once you've learned it, which will take time and effort, then you're set for the rest of your career.