Those 2 cars are realy different.
I have a WRX and a MP3 (wife's car now) and I did a road test of a MSP (friend). It realy depend on what you are looking for.
The WRX is realy a special car with very good power and it is AWD. Here in Quebec with the winter that we have, the WRX is the BEST car for me. Power and traction!!!
But like somebody else wrote before, the handling is not as good as the MP3 or the MSP. To get some good handling from my WRX, I installed 225/40/18 tires on Rota Battle wheels, Eibach Pro-Kit and STi replica struts bars. With this stuff, it's a lot better but on clean and dry road, not as fun as the MP3 or the MSP. But on a wet road... it's a way ahead of the MSP!!!
The MSP is a very good car too. Very good handling, good looking, nice sound system and reasonable power.
The interior of both cars are very similar. They are very good looking and fun to drive cars
If you look for handling and for a car well equiped at a reasonable price, go for the MSP.
If you look for power, for lot of traction and for a more sophisticated car and have the money for it, go for the WRX.
With any of these two cars you can't go wrong!
