top five ex. for bigger biceps

[jbran23]

that's an isolation exercise though, you can add more mass with compound exercises

More overall mass, yes, but the bicep is being worked SECONDARY to your back in pullups.

For mass strictly to the bicep itself I would say the standard straight barbell curl using principals such as rest/pause and heavy cheat curls would be best IMO. Variety would also be key though but that should be a staple in any program.