Gear Oil Question Chevron Delo

[Waterloo]

Ok, been bouncing around the internet and am finding some interesting things in regards to Chevron and their lubricants. From what I gather, Chevron has been at the forefront of developing the additives that our motors and drive lines require. I'm no chemist by any stretch, but looking at their motor oils, and their history of advances like Boron and ZDDP (Zinc), and the higher ppm's of these needed additives is steering me to go all Delo in my truck. So, it is time to drop the gear oil in my rear ends. I think I am sold on the Delo products and am wondering, synthetic or their ISOSYN blend? Any thoughts?