What is the main differance between these UPS's? Which one would I want?

Hi,

Never really looked into UPS's before. Need one for a Network closet.

Dell T430

2 Switches (1 POE)

1 16 port DVR POE

Router

Looking at these 3 UPS's and not sure what the main differences are, besides the Voltages.

APC SMC1000

CyberPower PR1500LCD

Eaton SP1500

Thanks