well if we are going to argue what is better, then we need to have some assumptions.
and since many people have different religions, I think the debate should be limited to the best life or existence on Earth.
anyway, I am by no means saying that modern life starts off good, and gets worse. So if there is some life after death, then a pursuit of the best life (including the afterlife) may just involve suicide once you accomplish your spiritual goals on Earth.
I just don't see too much utility in discussing that for this topic.