Which army has the best technology?

The Army of the United States of America (U.S.A.) has the best technology. An example is, the Indian Army has purchased M-777 Howitzers, which are used by the US Army. These howitzers can easily be transported to very high altitude battlefields in the Himalayas, and it also has a very high accuracy rate in destroying the enemy targets located at a very far off distance. You can read about the Innovation for Defence Excellence – iDEX at the given link.

Further readings:

1. HAL – Partnering with Russia for Make in India Defense Projects
2. Defense Research and Development Organisation (DRDO)