All are created to automate in one or another way your bookkeeping. Some of them are more affordable than others, and each of them will support the different needs of your company.
However, most small businesses need a more advanced program, and monthly costs can vary from $20 to $60, depending on the functions you need and the number of people who need access to the software.
No matter what plan and program you choose, set up a daily backup plan to preserve your data on another storage, such as an external hard drive or an online backup system.