* Greater energy density, which means you need to carve less space out of your existing floor plan to make room for batteries.
* About twice the cycle life, so batteries need replacement less often.
* Can discharge more deeply without harming cycle life, so for applications where discharging happens frequently that means either the effective energy density or the effective cycle life is even greater.
* Better efficiency for <24h charge-discharge cycles.
These are all things that are more advantageous in this kind of application, where you can expect to see a lot of repeated cycling during hot summer months. For a telco application, where you're presumably only expecting infrequent use during occasional power outages, they'd be of negligible value.
Keep on reading to figures 5 and 6, where they look in more detail at cycle life, and the lead acid batteries start to look like a straight-up bad choice for this kind of application.