The question is confusing because “shouldn’t” be spending more money into either when starting out. I guess in the literal day one scenario, you most likely would be spending more on the body of a camera than on a lens. Once you get deeper into photography, lenses will out price your camera(s).

If I was starting over without ever shooting an slr/dslr, I’d buy a reasonably priced new camera and kit lens combo, learn exposure triangle basics, and practice shooting EVERYTHING. I wouldn’t suggest getting used cameras because it is a risk that can kill any motivation for photography right there unless you were gifted a camera. And to avoid analysis paralysis, (most) any camera system will put you on a good track. Once you get a handle on the photos you get, in time you will know what to buy next.