@Chris Downs, Disk Space Equalizer is the only balancer I'm using and it is above all others in the list. Based on the comment quoted above, my understanding is that new files will still be placed on the drive with the most free space and Disk Space Equalizer would still then move the files to another drive after that. So, while the end result may be the similar, it's not the same as having the new file initially placed on the drive with the least % used.
Having this balancing done after the fact results in an extra data transfer, once to the pool(to the drive with most free space) and then to the drive with the least % used. This extra step can take considerable time when double digit terabytes are involved. So, my inquiry was really more about being able to have new files initially placed on the drive with the least % used, provided the disk has sufficient space of course, and not having the need for balancing after the fact.
To be honest, I have not enabled the option to balance immediately as I was under the impression this wouldn't help as it would still have to balance after new data is written to the pool.