Well, I got a 3770K and I regret it, because it's nowhere near as good at OCing as my 2500K was. I could easily run 4.6GHz on my 2500K, but the 3770K is crashing at 4.2GHz.
If you can really get a 3600 for 100 bucks get it, but I don't know where people live, because the 3600 Ryzen's I'm looking at are well over 200 bucks here, then I would need a mobo and RAM, which would add up to over 500 bucks.
I pretty much had a lot of bad luck when I was trying to upgrade my 2500K, you can look at my other threads, I ended up having to buy a new mobo because bios flash didn't work out on my Z68 and in the end spent 170€ to basically get a slower chip with more threads. No mans sky stutters are gone yeah, but I suspect other games will run worse due to lower clock speeds...
If I could undo my mistake I'd go for a 60€ 2600K, they are soldered, so no need for delid because paste isn't drier than a stoners mouth and from what I've seen they generally overclock higher.
Unless you're already on a bios that supports 3rd gen, make sure you check that, if not, I hope you have better luck than me when flashing it.
TL;DR: 2600K>3770K, if new CPU's are expensive where you live like they are for me, go for it, if you can really get 3600 for 100 bucks, the 3600 is a no brainer.