If you have both an LSE Public Account and an LSE Network Account then you can use either account to access many of the School's web based resources. However your LSE Network Account has more permissions, for example it allows you to print and send emails and use the LSE Wallet, so you may as well use your LSE Network Account.
You are encouraged to keep your LSE Public Account as it will allow you to continue to access many School resources after you leave the School (when you might, for example, want to order a Transcript or take advantage of the Careers Service). It also gives you another way to access our services should you, for example, forget your LSE Network Account password.