The investment logic between people is really completely different

Recently, I brought my younger sister into the cryptocurrency world

She only does high-buy transactions

That is, she buys when prices rise, continues to buy as they rise, sells when they drop, and sells more the more it drops.

I'm completely the opposite. Over the years, I've been doing secondary investments

Basically all the coins I've dealt with are those that are declining

When they rise, I sell, if they rise again, I sell a bit more, if they rise too much, I liquidate my holdings

Which approach is better, brothers?