I'm really bad at doing neat pencil sketches and handwriting. Balsamiq easily lets be draw something up on my computer that looks obviously like it's "hand drawn style" and make is clear both to me while creating wireframes and to everyone else when I shard them that it's not intended to be high fidelity. I intentionally use Comic Sans to emphasize that.
If I were better with a pencil, I'd do these in a notepad or on graph paper - and then share phone camera photos of them.
F<or anyone who's ever died a little bit inside when their PM/boss say "Those wireframes are perfect. lets just hand those off to the devs!", I _highly_ recommend using whatever tooling or personal restrictions that workj for you - to generate output that is clearly "interface ideas" instead of being misinterpreted as "finished UI/UX designs".