The obvious difference between the two is the 4033 has a cardiod pattern, while the 2050 can be switched between omni, cardiod and figure8.
I wouldn't be surprised if the 4033 is the better microphone, though. Never used a 2050, but it
looks like it might be a multi-pattern version of the 2020. If that's the case (talk to a knowledgeable salesperson - not somebody at Guitar Center), then I'd avoid it.