I heard that Instagram has 53 times more engagement than any other social media channel, and have to say that my experience has been that it is far easier to grow a following and get comments and likes than any other channel I use.
I use IG, Twitter, Linked'In and Facebook, although I have abandoned my Facebook page a little until I can figure out the best way to use it.
I may have also finally cracked the best way to use twitter - something that has been bugging me for a while. Every time I see or hear something curious or interesting that is in any way connected to yachts, yachting, or my youtube channel...I tweet about it. This has resulted in a reasonable growth, retweets, etc.
Each channel should be used for the purpose it was designed for. If you think you can use other social media platforms as a funnel to direct people to your YouTube channel you will probably be disappointed.