I think it really depends per person. I am personally saving mine. When Act 2 starts, the red chips will then be green ones. So spending the tokens on Dice game or Slots, it will award green chips in Act 2. If you are spending them now, you will continue to get red chips. That's the difference. Do you want red chips (for donuts) or green chips (to get ahead) in Act 2?
The crafting currency will likely stall while you accumulate coins (as it's a solid way to get resources). So if you are trying to craft your prizes, you may continue on with red coins. It depends where you are at crafting wise, and if you want to get a jump on Act 2 if you should save or spend.