Are there any advantages to submitting the report electronically?

Yes. If you make changes, a Recalculated report will be placed in “For my attention” (RF-1088-R) a few days after submission. This new report will show the new/updated amounts you wish to transfer to your tax return. You will therefore not have to calculate deductions which you are entitled to yourself, which you would have to do if you submitted form RF-1088 on paper. And very probably for the tax assessment in June too.