It wasn't possible to vote for 2 countries, otherwise I would vote for both Iran and Turkey.
Reasons for Iran: Having land access to 7 countries, in west to Iraq and rest of ME, northwest to Turkey and then Europe, also to Caucasus, in the Northeast to Central Asia which is gaining more and more importance everyday, then Afghanistan and Pakistan. Also being very close to Indian subcontinent, and having shorelines north of one of the most strategic straits in the world (strait of Hormuz in Persian Gulf through which 30% of total oil exports passes everyday) and also being the only country to have access to Indian ocean,Persian gulf, Central Asia, Caucasus and Europe (through Turkey) and also ME at the same time, that's a big advantage for reexporting products from South Asia,Far east and even Arab countries to Central Asia, Afghanistan,Caucasus and Russia). And lastly having shorelines to Caspian sea, which gives us indirect access through sea to Russia and Kazakhstan too. Proximity to gulf countries could be another advantage. Also most of Iran is mountainous, which is a good advantage in case of wars.
Unfortunately many of these potentials are undermined due to sanctions.
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Gilamard
Reasons for Turkey are already stated in the thread, no need to mention them again.