D1 purchase for me, I hope Sega will release a PC and console version at the same time.
I will get the PC version on D1, I could also double-dip on PS4 if the console version looks and play exactly the same, just to "own" Shenmue titles in their physical form.
I had the DC games but I sold it for a good amount of money years ago.
Also Yakuza and Shenmue are VERY different. Both are based on japanase (and chinese for S2) culture, both have a mix between beat em up and rpg, but in Shenmue there are no random encounters, there are no sides (well, there are a few but they are hidden and I'm not even sure you can consider them side-quests honestly), Shenmue is less linear, since a lot of times you need to be in a specific locaton within a certain time, in the meanwhile you can do what you want in the city.
Similar games, but very different at the same time.