Escalation (expandalone) has 12 new scenarios across two new campaigns, which I feel are much superior.
But if you kinda bounced of Ashes, I mean, I can tell you all day that Escalation is better in so very many ways but it's still a $20 ask.
And honestly, my best efforts aside, Ashes is at its heart a skirmish game. I've done my damnedest to make some damn fine skirmish maps for all kinds of different team/pvp/compstomp scenarios, but the game still is what it is. I'm awfully proud of what I've made, but I'm also not going to come here and be like, "You just don't know good RTS games! Rargh!"
Personally, Ashes has totally ruined me for Starcraft-style RTS because what I enjoy is the larger-picture stuff: extracting resources here, defending there, sending reinforcements yonder. It's absolutely not in the same league as Starcraft when it comes to, say, doing weird Mutalisk kiting or Baneling nonsense or whatever. But I don't enjoy the micro, and freeing my attention for the macro/econ stuff makes it a game I, personally, thoroughly enjoy.
I suck at micro. But I do pretty well in Ashes because I queue up engineers (or later, teams of same) to build a bunch of defenses and infrastructure in my backcourt, form up some armies around my Dreadnoughts, and blow through my precious Quanta to turn the tide of individual battles by dropping drone swarms or nukes or fields of SCIENCE that heal my units because SCIENCE.
Not in marketing anymore, professionally. Just trying to explain why I honestly like Ashes today. Apologies for shilling, if anyone takes it that way.
And this is what you get when I don't delete my posts in this thread ;)