I don't know why they suggested for differential backup unless and until you migh have a differential plan to do the backups.
The backup stratergy should be full with incremental OR full with differential.
But in exchange differential is not recommended as it doesn't flush the logs and no point doing it as you can't take GRT with differential backups.
The best thing is to go for all Full backups or full backup with incrementals. If you want to run incrementals then full and incremental should be in policy.