Is 35 better in performance or any other metric than 25 or am I simply wasting space? 25 in are more portable and can easily fits inside your pocket, where as 35 are heavy and you will have to carry a power adapter, which makes the size as big as of a shoe box Neither of them are reliable, these both expansion cases have regular desktop/laptop drives inside them USB 30 connector on these case is also very fragile I have a client with a couple hundred 25" HDDs in desktop usage (miniITX POS systems);
Price Performance And Reliability Which Hard Drive Should You Buy And Why Fstoppers