Based on what you say you want - a mostly sample-based workflow - I agree with everyone else that the Octatrack seems like the easy answer.

They are both great, but the Octatrack suits your needs better. Also, the digital filters on the Octatrack really do sound nice. If nobody has talked about it here maybe you can search the old elektron-users forum because I seem to remember people waxing on and on about their love of the Octa filters.

I think you would be annoyed with having to use C6- that is super clunky compared to drag-and-drop to the Octa or the CF card. I do not recommend purchasing a RYTM expecting Overbridge to make that process any better. Sure, it will probably do that, but there are no promises yet from Elektron and you should really buy expensive gear like this based on its capabilities at this moment. If you are cool with C6 and not too concerned with bit depth then maybe think about a Machinedrum. 16 sample tracks and resampling with a great digital drum synth.

I like all of the machines, but Octatrack for you.