The future Androids are weaker than the current ones

So far, Trunks was completely untouched. It was almost too good to be true—that he was really fighting against one of the androids and holding his own. What he couldn't quite understand, though, was how android 18 seemed to be even stronger now than she was in the future. With the Z fighters it was just the opposite, as they would undoubtedly become stronger over time. Whatever the reason, he still undoubtedly had his hands full.

- Bringer of Death Chapter 38