Xero offers Free Trial, but Authorize.Net does not.
Xero is designed for Freelancers, Medium Business and Small Business.
Authorize.Net is designed for Large Enterprises, Medium Business and Small Business.
The starting price of Authorize.Net begins at $25/Month, while pricing details for Xero are unavailable.
Some top alternatives to Xero includes Quickbooks, Sage Accounting (Sage One), Zoho Books, Zoho Daybook, QuickFile, Sage Business Cloud Accounting, MYOB, QuickBooks Desktop Pro, QuickBooks Online Advanced and Sage 50cloud Accounting.
Some top alternatives to Authorize.Net includes Stripe Payments, QuickBooks Payments, PayorCRM, UniPay Gateway, NETELLER, NextPay Payment Gateway, Airpay, Better Payment, aPay Payment Gateway Systems and PayNet.