The Deluge currently appears to not be buyable anywhere here, and if I bought it directly from them in NZ and add import tax to that, it probably won't be that much cheaper than a OP-1, if at all. And then the Deluge is at its core a step sequencer, so you can't even record unquantized. Might not be important to you, might be the killing missing feature for someone else. But never having owned a Deluge I can't say much more about it.
The AKAI Force is not that much cheaper than an OP-1 here. Is it "way more capable"? I don't know. But it doesn't even have a piano-like keyboard input, so again, at least one very distinctive feature it doesn't have compared to the OP-1. And then look at it. Would you want to take your AKAI Force on your commute to jam? I wouldn't.
The only one that really is significantly cheaper is the MPC Live, which I don't know, so can't really judge. But this seems to be a sampler at its core, so not sure about its synth capabilities? And it also doesn't have a keyboard...
Edit: well, I stand corrected - the Akai MPC Live II costs the same as on OP-1.
Ah, but can you power all of those from a battery pack and keep them on your lap on the train after taking them out of your small backpack? And all at the same time!
Not even close to true. Deluge, MPC Live, AKAI Force are all waaay more capable and cost about the same new as a used OP-1.