When comparing Battlegrounds (BRPG or BGE) vs ZunTzu, the Slant community recommends ZunTzu for most people. In the question“What are the best software tools for playing tabletop games over Internet?” ZunTzu is ranked 6th while Battlegrounds (BRPG or BGE) is ranked 7th.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Works very well even with esoteric RPG systems and rulesets
Truly system-agnostic, unlike other VTTs that are clearly intended primarily for D&D or d20 systems.
Pro Provides comprehensive support for tokens on tabletop
A great feature of BRPG and BGE is that they provide comprehensive (and perhaps it isn't a stretch to say "unmatched") support for tokens on the tabletop.
Pro Only the host of the game session has to have bought a license
Since BGE comes with anywhere between 1 and 15 free Player Slots, those players only need the free BGE Demo to play.
Pro Easy to create digital game conversions (BGE)
One of the better features of BGE is that it is very easy (and even fun!) to create a personal digital game conversion.
Pro Free artpacks available for download
Professional-grade content available for free is definitely a good thing.
Pro Free digital game conversions available for download
What could help offset the price of the software a bit is the free software conversions that are available on site.
Zombie-lovers in particular should take note, as five of the game conversions offered are zombie-themed.
Some free game conversion can also be found on Pinterest and boardgamegeek.
Pro Over 200 games
Pro Free
Pro Built-in audio chat
Cons
Con Commercial
Both editions cost money.
However, every BGE client comes with anywhere between 1 and 15 free player slots, allowing that many people to play using just the free BGE Demo.
Con Not fully cross-platform anymore
Although earlier versions of Mac OS X are supported (v10.1.5 through v10.6), more recent versions of Mac OS X (those lacking Rosetta support) are not. And there is no official support for Linux (but users have reported success running the program in Wine or Virtualbox).