Assuming your phone cannot be trivially unlocked by a thief, it likely is safer to bank on it than on a computer.
Because unless your desktop is dedicated to banking, there's always the chance that one of your other activities will install malware. If you don't use FDE (the majority of people) and you saved your banking password in the browser rather than a password manager (likely a scary amount of people), then theft is also an issue.
Neither of those things are really a problem on a mobile device.
Because unless your desktop is dedicated to banking, there's always the chance that one of your other activities will install malware. If you don't use FDE (the majority of people) and you saved your banking password in the browser rather than a password manager (likely a scary amount of people), then theft is also an issue.
Neither of those things are really a problem on a mobile device.