After finding this thread about Jerry Cans:
http://www.ar15.com/forums/t_10_17/665660__ARCHIVED_THREAD____VALPRO_Ltd__Jerry_cans__FREE_SHIPPING_on_orders_over__199__5_24___5_28.html&page=1
I decided to find out which jerry can was really the best or if there was any difference at all. After reading about Valpro and GELG it was hard to tell which was better and these two are the top two manufactures and produce the best quality jerry cans. I ordered one 20L Valpro can from here:
http://lexingtoncontainercompanysonlinestore.mybigcommerce.com/jerry-can/
And then ordered one 20L GELG can from here:
http://www.prepandmore.com/brands/Jerry-Can.html
Both are very nice and initially it was hard to find any differences between the two. After looking them over good I did notice that the handle welds were much better on the Valpro. Not really the quality of the welds, just that there was a lot more weld on the Valpro. The GELE had much smaller spot welds around the entire handle where the Valpro has full length continuous beads. This probably would not make any real world difference but I would always prefer more weld like a full length bead then just spot welds. The only other thing I could find that was different was the handle construction. Again the Valpro had a little better design. The way the handles were pressed out of sheet metal the Valpro had a much tighter seam/gap on the bottom side of the grip. The GELG had a much wider seam and with the weight of the full can you could tell the Valpro was more comfortable because of this. Again a very minor detail that probably does not make a bit if difference in the real world but it does add a tiny bit to overall quality.
Both cans are far superior to anything else on the market and worth the $29-49 price tag. I plan on buying more in the near future and will most likely buy the Valpro cans just based on them having tiny overall quality improvements over the GELG. On a side note the Harbor Freight (Midwest Can Co) jerry cans are made by Valpro but have the awful CARB compliant nozzle and traditional threaded mouth on it. I have one and will be ordering an EZ Spout to try and fix this problem.
The only improvement I could think of for any metal gas can was have some kind of rubber feet added to the bottom to protect from dents and scraps. I made a template and cut some rubber "feet" out of some thick old conveyer belt for my Jerry cans and glued them on with contact cement. It works great and protects the bottom of the can from all angles. See picture below: