Our major candidates for quantum gravity are as you know String Theory and Loop Quantum Gravity. Loop Quantum Gravity is about the spacetime curvature as a priori. String Theory is about the Flat Spacetime as a priori (although I'm not sure if the 6 compactified dimensions are considered Flat Spacetimes). Personally. I don't like both of them. LQG will rise and fall depending if the hunch is right that spacetime is really curved. And String Theory kinda contrived, and the non-perturbative version AsD/CFT doesn't even describe our universe due to the negative curvature. Does anyone know of a web or papers that summarize in not so technical way the other approaches and their strengths and weaknesses? Or maybe if you know them, just give a brief assessements like their strengths and weaknesses based on your opinions. Thanks.