What are the most popular game modes in gta online?

The provided evidence describes Grand Theft Auto as an action-adventure video game series developed by Rockstar North, focusing on open-world gameplay with driving, shooting, missions, and side activities. However, the evidence does not contain information about specific GTA Online game modes or their popularity. Without verified data on player preferences, community surveys, or official statistics about GTA Online's various game modes, I cannot provide an accurate account of which modes are most popular among players.