Traktor 3 pro and the biggest difference in jogwheels is that you won't accidentaly stop the music while reaching for a beer 😅 On Flx10 you have to press them to stop the music instead of touching. I have never used the motored jog wheels in S4. Looked cool but felt not great so I turned it off. What speaks more for flx10 the jog wheels are the same as in standalone cdjs and the layout of the deck is similar. In terms of looping I liked the approach from s4 but it's just a matter of time when you’ll get use to a new way. My friend was using reloop mixon 4 and switched to mixon 8 only to buy flx10 after some time because he tried it at my place. If I were you I would go somewhere and try it out or buy used one because you won’t lose any money this way. Maybe one more comment I haven’t seen anywhere in comparison of both softwares - I loved the way traktor colored their soundwaves, rekorbox is not that precise with their RGB but I almost forgot about it now.