Dreadbox Typhon vs Korg Volca

So that's the envelope and mod depth here is both positive and negative. So we mentioned that then there's the sample and hold lfo now i'll, just zero...

Not worth it. The DX7 is so well emulated on pc and on ios/android that allow for better programming and patch management that getting the hardware is a bit silly for the sound alone, and there are plenty of other, better late 80s / early 90s synths that feature the FX20 or FS style keybeds of the DX7.

2) If you plan to be DAWless, then only buy gear that is capable of a hardware MIDI connection (TRS or 5 PIN DIN plug). MIDI IN is paramount, but MIDI OUT + THRU is great to have as well. USB MIDI either requires a DAW or a MIDI host (which can be expensive), so a unit having USB MIDI is certainly a plus, but generally won't be used in a DAWless setup.

You only need to connect the audio output of your iPhone/iPad to the Sync input of the volca.

If you want to pay Behringer-like prices for a mono synth but would prefer to get something that isnt a shameless clone, has modern features and effects, while also supporting a small company...

Behringer Deepmind 12: Bought mine because it was cheap. It's kind of the "bastard child" in my current rig: I don't dislike it enough to sell it and it's quite useful, I just avoid using it.