I recommend MetaMask. Full control, with a generated seed phrase ...easy to set up. A seed phrase is a series of words generated by your cryptocurrency wallet that give you access to the crypto associated with that wallet. Think of the wallet as being like a password manager for crypto, and the seed phrase as being the master password. The popular centralised exchanges carry risk, owning your keys. The saying goes: Not your keys, not your crypto
Bitcoin cannot be stored on MetaMask. Maybe for you that's a good thing, considering fees. If your business can accommodate USDC (the Coinbase stablecoin), I recommend that, removing volatility, as value is pegged to the US Dollar. If you want your asking price to remain on point, a Stablecoin is your answer. If you can't / don't want to follow that, and solely want to do Bitcoin, like with DAN, I suggest a Coinbase wallet (reasonably safe)
If you are doing regular crypto business, look into offline hardware, such as Trezor / Ledger. When in control of your crypto, never under any circumstance tell / share your seed phrase. In crypto, your security is your responsibility
Hope this helps