Take a definition of ACTIVE contributors, because both projects have a lot of inactive contributors that only registered and didn't do anything but just one update and left, if any.

Google is known for dropping projects that they can't monetize enough. Maps' been around for a while, but it can always just disappear for public use. Or decide that you need a Google account too use it and that's a privacy nightmare. We need alternatives, but in this case, we need free and open source alternatives. We can't put all the eggs in the same basket.