There are probably large differences between countries here, but for me a wire transfer would clearly be the cheaper and easier option. They don't cost anything

There are probably large differences between countries here, but for me a wire transfer would clearly be the cheaper and easier option. They don't cost anything in fees. Speed is not that great, but usually good enough. Another option that is often very convenient is the "Lastschrift", I can simply grant a company permission to withdraw money from my account. The protections for the customer are very strong with this, I can revert any withdrawal without any reason, so this is essentially no risk for me.