As always that kind remakes - not so good (*). Exactly Stratagus/Wargus - pure project's. It just engine demo, just personal experiments in developing. Now dead. It not add anything except Linux support (again, as always). Absolutely nothing: not new features from Dark Saga, not any from Bnet Edition (wargus based on dos version of ToD). Dont remember expansion support... Probably have in current version. And custom maps probably too.
On Windows better play GOG version with GOG dxwrapper and war2 ru version (or gateways only). Especially if you interest in playing with someone. On Mac OS X better use Win+Mac Retail version + emulator. I know some exist, for both Mac OS X and Windows NT. I saw on YT.

* Especially AI is problem. It must be rewrite in each that kind project's. And only some can handle with that. I'm not sure, but probably War1gus have better AI than original, but it cause original have critical problems. Or I saw it from other War1 remake... yep, something on old-games .ru russian forum, not War1gus.

I play with Wargus and it is great. It has widescreen support and several QoL features such as unit queuing and waypoints. It also provides better graphics with higher resolution support and filters.

In terms of campaign, it is not entirely a one-to-one replica/experience, there are cases where the AI is a bit weaker at certain points (on guerilla missions). Example on Alleria's mission, Human campaign dark portal 1. Where if you hit a group of zombies with a ballista, they don't react (unless a splash damage is dealt) which ending up becoming easier for the player as they can just snipe the mobs one by one.

In all honesty, Wargus just makes everything easier (because of the additional QoL it provides) which makes the game more fun for me. However I do understand that some people do not like this and as such it is better if they just use the launcher that is available on gog.