It's not really a "right" or "wrong" thing. It's whatever fits your needs.
It's just good to know what the differences are. SSDs are especially good
for quickly powering up your computer if you're anxious about such things.
As you'll notice in that WD link you sent, there's an SSD version
and when you click on it, you'll see that it costs almost twice as much,
so that's sometimes a deterrent to some folks. 😄
BTW, none of my stuff is currently on SSDs - only because I'm
waiting for the prices to go lower - coupled with the gleem I
have in my eye for finally getting a new computer soon.
Also, I'd have the (completist) feeling that I'd have to port all
of this music over too, and that's something I'm not ready to do yet.
...but, that Passport is nice and small (I use one) and most
of my other HDDs are big ol' clunky WDs that work great!