It depends on the tournament I'm playing, the main thing is to play knowing what to do, if you play, enjoy and have fun, but if it's winning, I played everything in favor of the statistics.
As a hobbyist I don't use any stats, but if someone is determined to be a pro, it's inevitable to look at the percentages and build into your game.
I don't think anyone can become a professional without it.
Utilizing statistics in online poker is immensely important and can significantly enhance a player's game. It provides a quantitative foundation for decision-making, offering insights into opponents' tendencies, your own playstyle, and situational advantages. For example, understanding a player's VPIP (Voluntarily Put $ in Pot) can reveal their general aggressiveness or passivity. Similarly, a high 3-bet stat might indicate a propensity for pre-flop aggression.
A bit of both. I have learned off the basic odds etc, it does sometimes frame how I play a hand. I usually play abc poker, and play more aggressively late in tournaments.