Both bad. Android may allow side-loading a bit easier than Apple, but the Play store is still a large monopoly on Android. It comes pre-installed on basically every device and is the de-facto way of installing software there. Side loading requires the user to click past a bunch of scary messages that is not required for apps installed through the Play store.

It is much more difficult to distribute apps from outside the original store when compared with desktop platforms. Changing this would be a good thing for users and developers alike, for both Android and iOS.