Nope especially when when it's right there on the box, documentation and so on and there's bench tests galore to point out which to get and which to avoid so I won't advocate one particular brand or model. You're needs and mine will differ.
My only suggestion is that if you do use SSD perm BU to save your HDD backup data so you can format your backup hdd, when full is that you do invest in a slide tray. Saves tons of time, effort and ware and tear and when I'm not using it for permanent backup another HDD goes in the slot. On the drive that I usually plug in is Win XP Pro SP3 I pulled from said permanent BU with all the tools and X3 reunion and TC among other games of the day.
Now Hank001's Math For Fellow Tech Geeks!
Figure this equation:
HDD w/ 0 BU = 