This really depends on the stage your company is at. If you haven't found product-market fit, you need to spend a majority of your time in sales mode talking to potential customers/users so you can figure out who your ideal market is and what your market wants. If you try to start marketing without finding product-market fit, you may end up wasting a lot of time and money without knowing whether anyone even wants your product.
It also depends on who you're selling to as well. Consumer/SMB customers may require less sales efforts than enterprise customers. You will always want to start with talking to users regardless, which is sales.
It also depends on who you're selling to as well. Consumer/SMB customers may require less sales efforts than enterprise customers. You will always want to start with talking to users regardless, which is sales.