Different philosophies : Shuttle's XS35V5 ($200) is clearly designed for passive cooling with a vertical position, a meshed top, and an effective chimney effect. While Zotac's CI323 ($150) is, well... different.
Shuttle XS35V5
✓ Celeron N3050
✓ 1 x DDR3L slot (up to 8GB)
✓ 1 x 2.5" bay
✓ 2 x USB 3.0
✓ 3 x USB 2.0
✓ 1 x HDMI
✓ 1 x DisplayPort
✓ 3-in-1 card reader
✓ 802.11b/g/n
✓ 1 x Gigabit LAN
Zotac CI323
✓ Celeron N3150
✓ 2 x DDR3L slots (up to 8GB)
✓ 1 x 2.5" bay
✓ 2 x USB 3.0
✓ 2 x USB 2.0
✓ 1 x HDMI
✓ 1 x DisplayPort
✓ 3-in-1 card reader
✓ 802.11ac + Bluetooth 4.0
✓ 2 x Gigabit LAN
