1. The new Instax Neo. Pros: finally a serious camera from Fujifilm. Cons: Small images. No monochrome.
2. Instax 210. Pros: Nice sized photographs. Great color. Cons: A joke of a camera, no monochrome.
3. A Polaroid Land camera: Pros: both color and monochrome. Good image size. Cons: Old camera, hard to find in China, questionable reliability.
Tough call.....each option has an appeal to me.
You could also shoot instant in a "serious" camera. Peel-apart Fuji in my Speed Graphic is a lot of fun, and a lot easier than stuffing Instax into 4x5 holders individually.