I like to think of it this way: one Copic Sketch (with upcoming price increases) plus one refill will yield approx. 15 non-refillable markers for an end price of under $1.25 each.
I believe Spectrum Noir markers are also refillable, and I have no personal experience with them, but I do believe Copic markers to be the very best that exist. That's why they're used in so many applications beyond paper-crafting.
I recently learned that each of the Superbrush nibs are hand-woven. I have not experienced a marker tip that enables the type of precision and versatility of this particular tip.
For my money, I want the very best when it comes to tools, and when I really look at price versus cost, Copic wins, hands down.