Scale Computing HE100 appliances are Intel NUCs.
Scale Computing HE500 appliances are either 1U building blocks or Towers.
Scale Computing HC1200 appliances are 1U building blocks.
Scale Computing HC5000 appliances are 2U building blocks.

Lenovo HC3 Edge ST250 appliances are Towers.
Lenovo HC3 Edge SR250 appliances are 1U building blocks.
Lenovo HC3 Edge SR630 appliances are 1U building blocks.
Lenovo HC3 Edge SR650 appliances are 2U building blocks.

Denser nodes provide a smaller datacenter footprint where space is a concern. However, keep in mind that the footprint for other datacenter resources such as power and heat and cooling is not necessarily reduced in the same way and that the concentration of nodes can potentially pose other challenges.

NUC = Next Unit of Computing