I did a lot of comparison between the two and ended up getting the Alphatrack.
The Faderport feels a lot better. The fader is much more solid and the buttons have a better feel. The Alphatrack feels pretty cheap and the buttons are loud and have a terrible feel.
But feature to feature, the Alphatrack wins out and it has lasted me 4 years of nearly daily continuous use.
I don't use it for as much as I thought I would. After getting stickers for my keyboard and learning all the shortcut keys, I find it faster to use the keyboard than the alphatrack for all the usual control stuff.
Even with the touch bar, I am faster with a mouse and keycommands on the keyboard.
I do still use it for doing automation, precision level setting, and getting sends going and the like.
The fader flip and programmable buttons are super nice. But again, key commands are faster for me.
So I guess if you are using the fader and control only, then the Presonus is the way to go for better feel. But if you want flexibility at the cost of cheapy feel, then got he Alphatrack. As I said, I went with the Alphatrack.
For controlling other plugins, also take a look at the Novation Nocturn. That thing is pretty sweet and the programming is super easy and quick. I actually use that a LOT. Now that I have it all programmed the way I like it, it is really sweet for controlling EQ's and compressors.