If you are not whales, buying Bitcoin directly and hodl it, wait for profit is better than mining it.

Because if you want to mine it with ASICs, you must buy those devices, find electricity sources should be cheap, locations for your farms, etc. There will be more things for operations, maintenance, etc. It requires big initial capital, time to operate and you must wait months to get your initial capital back. That is not good for small miners.

When you need money instantly, you can not sell your ASICs and other devices instantly to get money. If you buy and have Bitcoin, you can sell it instantly.