As always with these questions whether to get a digi or one of the flagships, my answer is: it mostly depends on the workflow you prefer and how deep you want to go.
The digis are better for getting ideas and happy accidents fast. The flagships are better if you know exactly what you want to do, then prepare and execute that with precision.
Syntakt, like all digis, is more streamlined and immediate, thus a bit easier to learn and operate. Itās designed for fast results and quick jamming. One of many examples where that shows is that it doesnāt use kits. This means you can jam out an interesting pattern, copy it, mess with tracks and parameters or control all, copy that to another pattern and mess further etc.
On Rytm, you would have to save the kit as a new kit before messing with the pattern, otherwise you lose your original sounds. That takes the flow out of jamming, but comes in handy for when you are preparing a live show or want to record a track/pattern, where you constantly change the same kit over time. You can also set up performance macros so that a chosen set of parameters change by a pre-defined amount when you turn the quick performance knob or press down a performance pad. Syntakt wonāt give you such precise control and preparation tools across parameters found in different pages.
I think thatās the fundamental difference between the digis and the flagships that should decide which camp youāre in, depending on your use case. Both have lots of potential to grow into, but the flagships go deeper, at the cost of a bit less immediacy. With the new OS, Rytm can do even more things that could at the same time also be a bit overwhelming.
Other obvious factors to help deciding: Syntakt has two LFOs, 12 tracks without choke groups, FM sounds. Rytm has samples, analog filters/compression on these, pads. Syntakt is smaller but has more funct+XY combos, Rytm is bigger but has a bit more buttons, meaning less funct+XY combos.
Edit: Since we have these topics āshould I get digi XY or flagship XYā constantly with the same answers, users could maybe search these before opening a new topic and see if thereās any open questions left. This question could have been posted in an existing topic comparing Syntakt and Rytm, asking about what has changed after 1.70.