As always, it depends on your needs. 
With the Machinedrum you can create a beat in a short amount of time, and quickly you can adjust settings for each drum track.
One of the biggest benefits in my opinion is the ability to press the ‘Function’ button and tweaking a parameter, which affects all drum track at once, which leads to a instant change of the whole sound of a pattern.
Of course you can prepare a similar effect with using scenes in the Octatrack, but it’s not intuitive in the same way IMO.
On the other hand it’s a nice peace of gear for glitch / IDM stuff, if you know how to use the CTRL+ALL-function.
This video has been posted several times in this forum I think and sold this machine to several people (including myself):
You can also assign 16 tracks, with the Octa you only have 8 tracks.
Listen to sound examples on youtube, it has its own digital sound and it’s not everyones taste, but if you spend some time you can also reach “deep” sounds.
Keep in mind that the Machinedrum is mainly a drum machine with sampling capabilities, whereas the Octatrack is a performance sampler which can be used as drum machine, but doesn’t produce sounds on his own.
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