I have two JohnDow tanks and I would buy them again. I've never owned Vevor tanks but have looked at lots of photos of them. The components that Vevor use don't appear to be of the same quality as those used by JD. Compare the nozzles for example, compare the quality of the crimped hose fittings (hydraulic hose vs. garden hose) and the JD pumps are made in Italy, not China. If you need technical or warranty support JD has a phone number and a CS email address, but what are your chances of getting help from Vevor? I can't speak to the longevity or reliability of the JD and Vevor storage tanks, or the long-term performance of the blown tank shell in terms of exposure to UV and other environmental variables, but I would expect a US company specializing in automotive service equipment for the last 40 years to have a better handle on this.
My decision to support a US company over a Chinese one is personal, and I'm ok with paying more for a product that's designed and made by a company that specializes in automotive service equipment. I'm not saying that Vevor owners have made a bad choice, just that my criteria for choosing a product is different to theirs.
Check out JohnDow Industries' Fuel Handling showroom for all your automotive fuel handling needs, including fuel tank adapters and pump kits.
johndow.com
At the end of the day, these tanks and nozzles store and dispense fuel. Given the cost of fuel and the amount of fuel purchased over the next 20 years, the upfront savings of a Vevor over a JohnDow are insignificant. I'd rather support a US company that has been in business for decades and that makes a quality product rather than a Chinese conglomerate who makes a clone of a quality product but comes up short (in my opinion).