good question- i guess best means:
- most options
- most connectivity
- most portability/compactness
and of course those things are all relative to each other. some people talk about the beatstep pro, there's the pyramid by squarp, i guess even the arpeggio on kickstarter right now could be a thing.
then, i suppose there's another camp of people who would suggest even something like the octatrack as the best hardware sequencer... or iPad running a certain app, aira tb-3, etc. but i'm mainly looking for a dedicated hardware device that more or less only does sequencing really really well... eurorack or other modular formats also welcome!