The Russian built Mi-26.
There are lots of types of aircraft on the world. Aircrafts are separated by engine number, fuselage dimensions, engine types, military or civil, passenger, cargo and helicopter.
The largest plane in the world is the Antonov An-225 which is a cargo plane.The largest passenger plane in the world is the Airbus A380.
In terms of maximum cargo carrying capacity, the Antonov AN-225 is the world's largest cargo plane. In terms of maximum volume, the Boeing 747 LCF Dreamlifter is the largest.
The world's largest helicopter was the Mil V-12, which had a gross weight of 105,000 kilogrammes (around 231,500 lbs.).
The largest plane in the world is the Antonov An-225which is a cargo plane.The largest passenger plane in the world is the Airbus A380.
This is the Turkish military, fourth largest military force in the World.
The biggest cargo ship in the world is slightly larger than the 2nd biggest cargo ship in the world. In other words, the 2nd largest cargo ship in the world is smaller than the biggest one.
China
There is no answer to this question, as it is like asking "Which is the best car in the world?" It all depends on what you want to use that helicopter for, and no helicopter can be very good at more than one general area. In the same way that a Formula One racecar, semi-tractor trailer, luxury sedan, and cargo van all excel at what they do, and generally stink at what the others do, the same goes for helicopters. Please re-ask the question in a more specific manner as to what mission (i.e. purpose) you want the helicopter to excel at.
INDIA
The Soviet Union made the largest helicopter, the Mil Mi-12. The first prototype made its first lift-off on June 27, 1967.
The Russian Tupolev Tu-160 is the world's largest bomber.