I have the same setup. DIGITAKT + SP 404 MK2. I don’t use either exclusively in one role. But I do use the workflow you’re referring to a lot.
I usually have the DIGITAKT outs to 404 inputs. And digitakt midi outs to 404 midi inputs.
I make my drum sequence in digitakt usually 4 bars. Then after I get some chops going on the sp, I will audition the chops over the digitakt sequence.
This allows me to use the skipback function to resample everything and capture happy accidents
Or the traditional resampling method once I think I have my final draft.
Or use the digitakt to sequence the 404 via midi
Or I can sample the whole digitakt sequence and use it in the sp sequencer.
Or use digitakt overbridge to split out each digitakt track then multi track the sp on top in the daw
All in all I think this combo is perfect harmony.
I’ve always enjoyed a step sequencer sampler and sp pairing. I am now comfortable doing drums in sps thanks the sp forums battles, but when I first started out I used the ESX and sp combo as a crutch to help me with drum patterns. Step Sequence drums and play live chops and loops from the sp.