The STi is going to be cheaper and more reliable. The VR-4 is an insane fast car when modified, but costs a lot. Also, the 6G72TT engine has been known to have problems with it, unless you replace almost everything internal. If you have the money, I'd keep the VR-4, but other than that, I'd work on the STi, and build that. Let me know if you wanna sell that VR-4.