There's something about pencils. And, on the other side, there's also something about inked drawings. If you go with pencil (and just graphite in general), there are some rich, moody, beautiful ranges of values you could go with through the use of smudging, blending, etc. But, you could also do something similar using ink washes, refining your line work later on. Honestly, it would look great both ways. The crossroads of choice haha.