This short video by Bonedo compares the original Roland TR-909 against the more recent AIRA TR-8... and the very recently announced Roland TR-9. Only one of these is analog of course. That is, after all, what all the discussion has been about across the internet since the introduction of the TR-09 as part of the Boutique range. Roland tell us this uses an enhanced version of ACB (analog circuit behavior) technology.
As we haven't got hands on with these yet, we can't comment. However, here's a video showing a simple comparison of all three synth drum machines in action to help you decide which sounds better/more authentic, etc.
[Via: Michael Kruse]
For more info on the Roland Boutique TR-09 go here: https://ask.audio/articles/roland-boutique-tr-09-is-the-909-complete-with-acb-usb-audio-usb-midi
Or here, to the official Roland TR-09 webpage: https://www.roland.com/global/products/tr-09/