It's 2019. What are the differences between Ardupilot and PX4 for copter

Keeping in view latest developments in ardupilot viz a viz PX4, which stack provides mature, consistent, and feature-enriched platform in context of Copter only .

Simple answer : BOTH are mature , consistent , and feature-enriched platform!

Perhaps, but everyone knows that all the cool kids hang out here. :slight_smile:

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I think @khancyr gave a very politically correct but not very helpful answer :slight_smile:
Realistically, you’ll struggle to find an objective opinion.
I’d suggest that you try both, get as far as you can by yourself, and when you get stuck, ask for help.
Then make a decision.