I cover comment handing, and I handle A LOT, and could not without these tools. If you're new to this YouTube game, or your channel is growing (or not), you should DECIDE FOR YOURSELF if you need these.
These are GREAT tools, but there's no reason to use them if you don't need them.
You can try them out for free, or not at all. I cover the commenting features, which is the ONLY way I have been able to answer every single comment on my channel (20,000+ and counting).
I use and pay for both: