u/MIJ248

I am far from an Audiophile. I play 128k MP3s through Bluetooth on Beats studio 2.0s but I lowk wanna get into the Audiophile stuff. I found a pair of KZ Castors with improved bass for $32, and a pair of KZ Duonic for $38. Which do I get?

I can't really get myself to decide between those two, the 9810 or 9900, both are **AMAZING** devices and maybe even the best ever made. What's your choice? And why?