Meanwell vs generic power supply
Meanwell (assuming they are actually made by Meanwell and not counterfeits) are quality controlled by reputable company. They will meet FCC and UL/CSA safety standards and won't likely burn up or electrocute you without good reason. They may have more likelyhood of failing such a way that would be catastrophic for connected equipment. 

If you buy something from a less reputable company you are taking a risk, and I certainly would take the data sheet claims with a grain of salt when you are dealing with unknowns. 

Be sure that the Meanwell supply is actually an original. You don't want to pay a premium for junk with fake safety markings. And there is a lot of such stuff out there. eBay is not exactly a pathway for franchised distributors in most cases, nor is Aliexpress. You might have slightly better chance of getting your money back with eBay.