Is it a bad backup strategy in Oracle to have only Level 0 backups and Archive Logs in between with no incremental? If you backup the database with a Level 0 every six hours, then do the archive logs in between, every 15 minutes perhaps, what benefit would I have to incorporating a differential backup?  Essentially, full backup only with archive logs x minutes.  Particularly cumulative.  Is it only because of disk space?

I have read this,

Is it enough to have only full backup and transaction log backup only for a good backup plan?

But it did not help, as it includes a differential.

Edit:  I ask because I thought you had to have a full backup to use a differential in the first place.  So why not just have the full backup to begin with?
Do you have enterprise edition or standard edition? If you have enterprise edition you can create a block change file and do a true level 1 incremental backup. Doing a level 0 backup is a FULL backup. There is not reason for you to do a FULL backup every 6 hours. Most people do a FULL backup every day and possibly send the archive logs to more than one server. I do two level 0 backups per week and level 1 backups on the days when I am not doing a level 0 backup. If you are new to Oracle you may want to do a backup/recovery class. You should practice backup and recovery on development databases.