1.The Following Distances
Gwadar to Kandahar:494.12 miles and Chahbahar to Kandahar:535.19 miles
Gwadar to Kabul:768.81 miles and Chahbahar to Kabul:817.61 miles
Gwadar to Samarkand:1040.38 miles and Chahbahar to Samarkand:1058.62miles
Gwadar to Alamaty:1501.39 miles and Chahbahar to Almaty:1545.87 miles
and the list goes on and on.Except for Herat and Ashgabat Gwadar Has Got A Distance Advantage With Most Of The Major Cities In Central Asia Up To Omsk In Central Russia.
2.Gwadar is A Natural Deep Sea Port Unlike Chahbahar So It Can Handle Panamax and Cape Size Ships.Shipping Companies Love Deep Sea Ports
3.These Days Iran Faces Severe Sanctions.Even In The Best Of Times, It Faces Multiple Trade Restrictions.Inspite Of All The Difficulties Pakistan is Still a Major Non NATO Ally.When It Comes To Choice Western Companies Would Definitely Prefer Gwadar.
4.Chinese Did Not Invest Billions of Dollars in Gwadar to Start Trading in Chahbahar.Once Peace Is Stored in The Region You Can Bet That The Fastest Growing Economy In The World Will Start Trading Through Here.
I Concede That In The Short Term Chahbahar Will Succeed Because Of Peace and Stability In Iran as Well As Fast Developing Infrastructure.But In The Long Run Gwadar Definitely Enjoys Many Advantages Over Chahbahar