I had an 999 for a while which basically can also be turned into the 888 by using another OS (to have the additional parameters from the 888 like metallize on snare etc.).

I really liked the kick (it’s so huge) and the hats - but not so much the sounds of the toms. I would say for that you should wait until the AR is finally available to make a comparison and see what fits you best.

In fact I sold my 999 because I was very unhappy with the OS and the limitations of the sequencer. As already stated here it was quite buggy (but that was maybe 3-4 years ok - don’t know if/how it improved in the meantime). Anyway the elektron sequencer is on a totally different level as the jomox