IronArcturus: Has anyone tried the DLC from the Stellaris Stories Pack?
When Stellaris originally hit on GOG I was desperately looking for a distraction to work through some personal grief and Stellaris was a round peg for a round hole. Additionally, the launch discount on the existing older DLCs was pretty darn good so by the end of the weekend that included the promo time I pretty much had most/all of Stellaris up to that point. A side effect of that is that I don't have a good feeling for what vanilla Stellaris is.
My personal opinion is that the expansions for that price are probably the biggest deal.
The story packs are a bit more subtle in their content and according to the initial remark above I don't have a good feel especially regarding what Distant Stars adds. I wouldn't want to miss Synthetic Dawn though (play as a machine empire) and all the archeology in Ancient Relics is darn nice as well.
The species packs used to be just eye candy but since Lithoids (that means Lithoids, Necroids and especially Aquatics) they contain more and more mechanics to differentiate the different phenotypes. The Custodian patches have since also added smaller non-eye-candy additions to the older species packs.
The sequence in which I listed the different types of packs would be my priority if I had to rebuy them nowadays.
Edit: the Wiki I linked above is probably the best resource to do some personal digging for more details.
Edit 2: I just noticed that the story pack is cheaper than the species pack which is the inverse of what I had in my head when I wrote it. I flipped their sequence in my list since bang/buck works out a bit differently for me with the correct values.