Keep in mind if you trust your friend and know their driving style etc. it's generally easier and safer than buying an compared to buying an unknown example.

Out of the 2 cars the OP has mentioned, i would probably go with the EK4. This is coming from a previous DC2 VTi-R owner. Mainly due to the gearbox and overall fun factor. The VTi-R is a great cruiser though but not as fun. Just my opinion though!