Depends somewhat on what you're installing it in. Pre 1963 the 302 might be an easier istallation, post 1963 the 292. The 302 is a four main engine while the 292 is a seven main. The 302 is a very low revving engine compared to the 292 and probably weighs a couple hundred pounds more, so you need more power to be even. Getting a good head for the 302 is more difficult and other parts are expensive if you find them.
Baldy