Civization V vs Stellaris?

Civilization V has polarized the fanbase - some people love it, some hate it.
Basically, I - IV are a progression, just adding more depth each time. (more tech, adding religion, etc.). V changed a bunch of things, and it's love it or hate it kind of changes. Stellaris, on the other hand, is something different altogether. So you're evaluating something new, rather that comparing a game to the ghosts of the past
that being said, Civ V is a lot cheaper

Note, Stellaris is cheaper here:

http://www.wingamestore.com/product/5560/Stellaris/

You can't really compare a brand new titles with one fully developed classic, that's about to be replaced by its next generation. If you are tired of Civ V, buy Stellaris. If you aren't, wait for more DLCs, patches and better deals.

if you want civ 5 then must buy complete editions

buy civ and save 25€

over 400h in civ 5

Not a CIV fan at all. I'd say Stellaris.

From what I've heard, Stellaris currently feels a bit incomplete. Maybe better to hold off on it until it's ironed out the flaws.

Civ V (complete, as it is offered now) is the game I played by far most hours on steam - so you can guess I love it.
Stellaris is on my wishlist, but I opted for not buying it now as 10% discount doesn't sound that much, and there's probably much content still to come, so I will wait.
In your place, I would go for Civ V now and wait if Stellaris gets cheaper in christmas sale.

You can also take a peak at Endless Space 80 off. Never played it but it is on my wishlist long time.

IMO Civ V isn't exactly good especially for MP (albeit the expansions made it less bad), but Stellaris anyway is not a very "complete" game at this stage.

I'd say Distant Worlds :)