Samsung drives are pretty decent, although they don't really target the same market as WD's mainstream drives. The Spinpoints are really good low-power drives (although they have a higher spinup current pull than the WD greens).
Fujitsu drives are mainly seen in their laptops (don't know about their desktops) and in enterprise systems, and like with all things Fujitsu they tend to be a bit on the pricier side, but again their service support is good enough to be worth the premium (IMO).
Personally I’ll go with WD more, for personal needs. But I readily admit that it’s out of price considerations more than anything; WD prices just tend to be cheaper here, and Newegg doesn't ship here either. Also, for some odd reason, Seagate drives here only get 3 years warranty, while WD drives get 5...
Nice external by the way, it looks solidly built, and I like the vents at the back. I can't see too clearly, but are those Torx screws at the side? If yes, then yay for chunky Torx screws! \o/