EPDM, also known as ethylene propylene diene monomer, has a dark surface that absorbs a lot of heat in the summer, causing your cooling systems to work overtime, whereas TPO roofing reflects sunlight so that your air conditioners can work more efficiently. It is said that TPO (Thermoplastic Polyolefin) also has a higher resistance to punctures than EPDM.
So, it seems that TPO is the best type of RV roof.