What is the best renewable energy for the Middle East?

Solar Energy would be better for most Middle East countries and maybe a combination of solar energy and fuel cells (Hydrogen)

A combination of solar PV and solar CSP with storage, to provide a 24 hour solution that requires no additional backup and no expensive battery storage.

You can ٍuse Solar energy its the best .

Solar Energy

It depends on the weather of the country.
Some countries cannot use wind turbine and other countries cannot use solar panel.
Cannot use due to long pay-back period (not efficient).

Hybrid renewable Energy(it's like mix solar & wind turbine) it's the best echonomical option to use on stand alone system & you will have relaible system the battery bank will charge from the both sources so energy will be available 24 hour per day & 365 Day\year also the live time is 30 year & it's can work in small, meduim & large Scale projects .

Solar Energy (Solar Water Heating, PV and Concentrated Solar Steam Generation)

Solar Energy is the best source of renewable energy for the Middle East along with the use of  super capacitors instead of lead acid batteries for off-grid applications.Super capacitors can be used in solar power applications, battery back-up applications, battery applications, flash-light applications, etc. 

It's the solar energy. the Moroccan's experience in this field was very successful , now Morocco has the biggest solar energy station in the world.

Solar Energy is the obvious answer

solar and wind hybrid technology would be best suitable technology.