Anon coin is only for the tor network. Darkcoin should be anonymous on the internet full stop ('period' for my american friends)
Anoncoin will use I2P and coin mix services to grant anonymous transactions. DarkCoin promise an "encrypted transaction network" and "coinjoin" technology for anonymous blockchain. For me booth approaches are not soo different.
I would suggest that DarkCoin should use the TOR network to hide mining and transactions, since it is more reliable than i2p and much more mature. There is no point in reinventing the wheel, when reliable approaches exist.
IMHO it would be great if the DarkCoin miner and wallet software implements or interacts tightly with TOR. So that each miner and wallet will be part of the TOR network, providing a TOR relay to strength the network and anonymity.
I would suggest that all the cloud miners out there configure their VM's to be TOR relays while mining ... actually thats what i am doing.
The problem with TOR is people relate that with someone doing something illegal. We are not trying to invent a coin for that purpose, we want the average Joe to be able to use it without any or very little tech knowledge.
And IMO if we specifically join the coin with TOR it will put off alot of potential users.