chiming in on the state of MPC1000 JJOS (probably don’t need a whole lot of discussion on this, it’s a solid machine but definitely dated by some standards)
I don’t know anything about the newer MPCs.
as I see it, it’s super geared toward recording everything live (optionally with quantization).
There technically are grid/step editing modes, but not geared toward sequence creation (ok for tweaking things post-recording)
Recording isn’t a unified thing with playback like on Elektron; it’s a distinct internal mode, where you can’t do things such as seamlessly changing sequences after recording (the sequencer must be stopped to exit the record mode).
Nothing is step-based, unless you consider 96 divisions per quarter note to be steps… Virtually no limit on what notes can be sequenced where, unlike Elektron where even with micro timing, you’re on 4 notes per quarter note (unless you play some games with track scale, but there’s a trade off there)
Nothing is locked to 4/4; you can have arbitrary meters and bars, but it cant differ by track. You can chain patterns in song mode, but there are limitations (again, it’s a distinct mode, not the unified workflow Elektron has. Sometimes the best thing is to export the song as one giant sequence when you’re done)
There’s some support for playing 2 simultaneous sequences, which might open up some options, but I’ve never used that.
“P-locking” is limited at best. You can automate a few parameters like pitch, velocity, pan, a filter depth I think? But not arbitrary parameters, and it’s not a fluid thing. (you’re either editing note by note, or fiddling with a Q-link slider). Some parameters are also per-note, not continuous real-time.
So the Elektron is much more flexible and unified at a high level, but the MPC is in some ways more free in the nitty-gritty. The Elektron sequencer is, after all, a 64-step sequence sort of faking polyphony. The MPC is effectively a continuous piano roll, no limits.
I couldn’t personally make music without my MPC in some capacity, but that’s just me.
also, again, I’m talking only about the MPC1000/2500 JJOS situation (and the original Akai OS for them is even more limited). I’ve never used any newer MPC.