In terms of level design and boss encounters, I think I would probably give a slight edge to NSMBWii over the vanilla NSMBU campaign, but better co-op, the Nabbit chases, Challenge Mode, and the Weegee DLC put
the latter way over the top for me.
A defined pension benefit isn't really optional in most cases and I would argue that neither is CPP or OAS, so the
way I look at it (rightly or wrongly) is that you should look at the non-optional income sources as the base pay and everything else goes on
top since you have more control
over the
latter.