I voted for the Chap, but I wouldn't leave this one up to a poll, as they're extremely different knives. The Chaparral is an amazing slicer. It uses some of the thinnest blade stock I've ever seen on a modern folder and it has an extremely lean grind. It's also very, very thin overall. It's one of my absolute favorite knives as it is a fantastic cutter, but it is really light and thin, is in no way designed for abuse and, for some, it may feel delicate (I haven't found this to be the case, but just a warning).
The Native, on the other hand, is a stout little folder that cuts well, but is definitely built to take more of a beating. Thicker stock, more hand-filling handle, it's a tougher work knife than the Chap, though it's not going to match the cutting performance.
Both are great knives, so it comes down to what you want and value.