While in practical I do not see any significant difference in regular vs CAN+ application but by law CAN+ applications should be processed faster and does not require to produce financial documents.
and can plz explain Highlighted Part
On the new IRCC portal, Once you input your valid USA visa number, at the document upload step it does not require you to attach financial documents like bank statements etc.
So it is acceptable to apply without financial documents when you have USA Valid visa.
But in a good application, you should still add your bank statement in "Other Docs" section.
My recommendation will be,
fill USA visa details in the application
attach 2 pages cover letter, bank statement and other home country ties papers in "Other Docs" section.