Reply to Need Audio Inputs: sell S2 for an S4 OR keep S2 get Audio 8?

Been searching all over the community s for info on 'duo' or 'team' setups, but have not really found a good option for traktor with both DJ's having controllers. Most of them seem to be one playing a Maschine/F1 and the scratching decks.

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I've had my Kontrol S2 for awhile now and I love it. However at venues I am playing more often as a team (typically just a duo) which is less than ideal with the S2. Often the other DJ has a VCI-100, S2, or something also lacking routing inputs for audio in.

Playing style currently is just tag-teaming trading off every few songs. We would like to try routing decks; but we want to have two screens so we can see what each other are doing (VNC/Screen Share really wouldn't work for us).

What are my options? I have thought of a few but can't decide on the 'smartest decision'

1. Sell my S2 and buy an S4. Pros: keep compact design and familiar layout; dedicated C/D deck controls; Cons: upgrading only for the audio ports; 200$ upgrade arguably for 'ports'
2. Keep my S2, buy an Audio 8/10. Pros: no hassle selling S2; Cons: lose portability; more complex 'setup time'

Can anyone believe of any others? I even tossed around the thought of getting a Z2, but it seems porting a mixer for this sort of setup would be overkill.

Sorry if I missed anything; wrote this pretty quick.