I read both because at the time I had the delusion that the wait wouldn’t be that long. When I read ASOIAF, Winds of Winter was still listed as coming out in 2020 and we all know how that went. Something similar happened with KingKiller, I had no idea that the third book had been underway for so long, so I just figured I would just wait a little and then I could read books 2 and 3 together, which hasn’t happened yet.

In general, I usually engage with new series all the time and have no issue waiting for the sequel to come out, sometimes a book will be in my tbr list but it’s not top priority so when I come back to it I have the nice surprise that its series is now finished and I can binge read it. I’ll only avoid series where the author has been vocal about cancelling or not wanting to finish them, which is not that common.