#2 - Monero
- Cons: You should use Tor with Monero, but you have to set this up manually; it's all more difficult; you're exposed to exchange rate risk; transaction fees may be significant
It will be different when Kovri (I2P modification) is integrated with Monero.
If ChipMixer keeps logs (which you can't possibly know for sure), then they know exactly where the coins are coming from and going.
Does there any way to check if it really does?
Unless you have full access to their servers, then no. You must trust the owner/operator of the mixer service.