They are very different. Three Body trilogy keeps humanity as-is, time morphs the society and culture, but humanity more or less the same regardless. In that regard, I think Blindsight is better at exploiting the internal conflict within the humanity.

But the Three Body trilogy has many advantages over Blindsight in terms of time (it literally takes you on a journey from 1950s to the end of universe); dimensions (very concept that I haven't seen anywhere else); society (very acute transitions).

But really, they are both good. I also recommend Bobiverse series. Though it's not as good, sorry Dennis, but it's very enjoyable, every software engineer's wet dream that is. Haha.