Selecting the best payroll service will likely come down to determining which features of a payroll service are most important for you and your business. Gusto and Paychex Flex both offer the standard payroll service features such as direct deposit payroll, tax calculation and filing, and an employee portal for your team to track their pay stubs, hours worked and view tax documents. Both payroll services also integrate well with third-party software and have good live support services.