What is it that you want to achieve “rallying” those samplers together?
I also own both (SP16 & OT) as well as an MPC Live.
I got the SP16 because it is what I wanted the MPC Live to be (in terms of live performance). It’s somewhere between the MPC (16 pads, touchscreen etc) and the OT (live sample mangling / slicing / p-locking etc).
If you are after a sample mangler, happy accidents or just a sampler for live sound design, to me the OT is something really special.
The SP16 is more of a playback machine than the OT but definitely more playable and more sample mangler than the MPC.
If you lay out your use case a little more, I’m sure we’ll be able to give you a more specific recommendation than just reiterating our personal preferences