They're both good. I know more Cure songs than Smith songs so I'll vote for them. Starring at the Sea and Kiss Me Kiss Me Kiss Me are my two favorite albums by the Cure.
However, I cast my vote for Robert Smith and Co reluctantly. The entire decade of the 80's were the Cure's golden era. They peaked in the late 80's. I had a tough time following them in the 90's and beyond. Robert Smith just seemed to be struggling to come up with material. I mean, come on... "It's Friday I'm in Love" dude... are you serious? wtf happened to you man.