The best buying route depends first on where you live. Platform availability, bank support, identity checks, tax records, and consumer protections vary by jurisdiction.
Bank transfer is often cheaper but slower. Cards can be convenient but may add processing fees and wider spreads. P2P adds counterparty and payment-dispute risks even when an escrow system is present.
Start with country availability and official platform information. Then compare total cost and whether you can withdraw Bitcoin to a wallet.