One thing that may play into this discussion/topic/discovery is production numbers...
Although I was only able to find these numbers for the 1965 & 1966 model years for the Panels and Surburbans (with doors or gates), I thought it might be of relative significance. Here is what I found:
1965 Panel/115" wheel base/1/2 ton/2wd Production numbers: 8,228
1965 Suburban (doors)/115" wheel base/1/2 ton/2wd Production numbers: 4,686
1965 suburban (gate) 115" wheel base/1/2 ton/2wd Production numbers: 4,834
1965 Panel/115" wheel base/1/2 ton/4x4 Production numbers: 103
1965 Carryall (doors)/115" wheel base/1/2 ton/4x4 Production numbers: 444
1965 Carryall (gate)/115" wheel base/1/2 ton/4x4 Production numbers: 433
1966 Panel/115" wheel base/1/2 ton/2wd Production numbers: 8,344
1966 Suburban (doors)/115" wheel base/1/2 ton/2wd Production numbers: 6,717
1966 Suburban (gate)/115" wheel base/1/2 ton/2wd Production numbers: 5,334
1966 Panel/115" wheel base/1/2 ton/4x4 Production numbers: 170
1966 Carryall (doors)/115" wheel base/1/2 ton/4x4 Production numbers: 530
1966 Carryall (gate)/115" wheel base/1/2 ton/4x4 Production numbers: 418
Ultimately, the lower the production number, the rarer the truck...although this may not have anything to do with the reason to own one, it may influence which one to get, due to the rarity.
I personally like the looks of the Suburban. The lines are more pleasing to me, but if I wanted to advertise my business, I would consider a Panel.
