Offworld Network did an excellent comparison between TR-808 clones. The video starts with a short history of the classic drum machine, before comparing it to the modern TR-08 and TR-8 as well as iOS drum apps.
Comparison test of the Roland TR08 , TR8 and a few ios TR808 apps for iPhone & iPad. All recorded direct to Audacity through the Focusright Saffire 6 USB interface. No FX, No EQ, No compression added.