^ What RedFox said. The other thing I'll add is that regardless though, collaborations have their own advantage, namely that you can share each others subscriber bases. Say you each have 100 subscribers, or 1000 subscribers, well if you feature the collabs on both channels and provide links to each others channels, a whole bunch of your subscribers will now also subscribe to your friend, and a whole bunch of his/hers to you. So it's an easy way to quickly gain a whole lot more subscribers who'll enjoy your content.