Not unusual!
Possibly the Verbatim card is a
'little optimisitic'
Other issues could be the card reader in use. That is, while the Verbatim card is slower on USB card reader A, it may come good in terms of comparable speed on USB card reader B.
I'd say that in all probability, the Vebatim card is made to a price .. and the card is sourced from a manufacturer that uses lower quality parts.
I've generally found (with one or two rare exceptions) that the name brands will usually be of better quality .. but in saying that there is a limit to how much better quality I'll pay for too.
Toshiba, Samsung, Lexar, Sandisk .. all good brands.
(although I have had two Sandisk cards fail on me now, but my other 3 or 4 are still quite good).