Personally, Newgrounds is a lot more free than YouTube. With al of the false copyright claims, needing to worry about the algorithm and shit, etc. I will just say this, YouTube/Google barely gives a shit about the creators. Newgrounds has a more tight community, so I would recommend Newgrounds more.

Good luck, I'v been working on my YouTube channel for about 4 years, and i still only have 170 subscribers

Good luck youtube is a bitch to grow on compared to newgrounds especially if you are a animater if anything I'd recommend posting the same vids on ng and yt at the same time so you get exposure from ng and just try to funnel people into your yt but that's just me a guy who is scuddeling his yt channel and uploading purely on diviant art and newgrounds so I'm probably not the best guy to take tips from

im gonna sub now
here i go