The only thing they share in common is they both have a tracker sequencer.
Renoise generates audio using samples and VST/AudioUnit plugins.
Bintracker generates audio using emulated sound chips. It is specifically for producing chiptunes on vintage arcade/console sound engines.
renoise very much takes influence from modern daws, supports vst plugins and its own native effects and uses high quality samples. it's also full-fledged with tons of features, it's like the ableton live of trackers. bintracker is much more barebones and is still in pre-alpha, and it is primarily aimed to produce chiptune faithful to hardware.
It has a ton of features but unfortunately resizable fonts is not one of them - the UI text is way too small.