Beer dispenser or direct from the keg?

[Ncj113]

Hello,
New member here! I've been looking at beer dispensers like The Sub and Philips PD and came across the direct tap kegs where you do not need a beer dispenser. Instead you take it straight from the keg with an integrated tap.

I was wondering what the benefits of having a specific dispenser are compared to just having the keg aside from the dispenser being able to keep the beer slightly cooler?

Thanks!