Why Iran is more friendlier to India than Pakistan ?

Iran is locked in bitter sectarian contest for supremacy in Middle-East with Saudi Arabia & its allies.

•  Former Pakistani Army Chief Raheel is serving as head of a Saudi-led 39-nation Islamic military alliance (an-anti Iran military alliance).
• The current Pakistani PM Nawaz Sharif life was saved by Saudi Arabia during Musharraf era. It is alleged that Sharif family has business interest in Saudi. So, the current PM & his family owes a lot to Saudis.
• Pakistan created & helped Taliban to capture Afghanistan and Iran supported Northern Alliance along with India & Russia to sever their own national interest.
• Pakistani diplomacy is not as mature as Chinese & Indian diplomacy. Both countries have maintained good relationship with Saudis, Israelis and Iran at same time.
• Pakistani economy is not big enough to buy but more oil from Iran. India is among the top 2 buyers of Iranian Crude Oil.
• India resisted American pressure to a great extent and continues investing & buying oil from Iran. Till recently Pakistan was most important American allay in South Asia and Iran hates Americans.
• Iran alleges that Pakistan has given safe heavens to anti-Iran militants and an Iranian General has threatened strike inside Pakistan to destroy militants inside Pakistan.
• Pakistan is a Sunni dominated country and Shias have been reduced to second class citizen. India also has large Sunni population but Indian government has always treated Shias & Sunni as equal citizen.
• India & Iran wants a stable democratic Afghanistan but Pakistan want the return of Taliban in Afghanistan. 

Iran was Pakistan’s strategic depth under Shah regime till 1979 Islamic revolution. Iran openly helped Pakistan in 1971 Indo-Pak war. But the things dramatically changed after 79 revolution. Iran was against any American friend and India gradually became a friend of Iran. India (despite being an American friend since late 1990s) has helped Iran in dire situations when most countries had refused to help Iran. Many Indian companies like Uco Bank got blacklisted by West just for doing business with Iran. Despite having 3rd larges Sunni population, India didn’t neither have any sectarian conflict with Iran nor India is involved in helping militants inside Iran. 

India is a potential future Superpower and a future UN Security Council member and Iran would obviously like to have a good relation with India.