benefits of a phono preamp for me?

I am a newbie at phono preamps.

What would be the benefits to me from getting a Rogue Ares or another tube phono preamp?

Equipment:
Sota Sapphire with a Sumiko MMT tonearm and a Dynavetor DV-20X cartridge.
Rouge 99 preamp with phono stage.
Rogue M180 monoblocks.
Vanderstenn 2ce's with Pair of Vandersteen subs.