Gaming on PC or on a PS ??

HIII !!! How is ur summer going?? Im finally on summer break wth;;;

anyway, I just went on Steam and saw how GENEROUS they're being with this summer sale it's insane?? I've had Batman™: Arkham Knight on my wishlist for sooo long and i saw it went down to 4 dollars? (used to be 20$)

But the problem is, i'm buying a new PlayStation 5 next month and idk if i should wait until then and buy the PS version or should i just get it on my computer since it's soo cheap rn.

HELP ME WHAT SHOULD I DOOO, also if you know any other interesting games on sale rn please tell me!! Lots of luv xoxo;