I choose Monero 
Spectrecoin and Deeponion is like being said above similar. I agree that Deeponion has an advantage at the moment. Deepsend or something like that will be a good feature. It is something like mixer,you can read more about it here.
https://steemit.com/deeponion/@wekkel/deeponion-deepsend-explained
And they maybe have a smart contracts which would be a bigger advantage between these two. But Deeponion campaign is getting on my nerves, which is maybe not so relevant, but still lot of spamming from their side.
Spectrecoin and Deeponion is like being said above similar. I agree that Deeponion has an advantage at the moment. Deepsend or something like that will be a good feature. It is something like mixer,you can read more about it here.
https://steemit.com/deeponion/@wekkel/deeponion-deepsend-explained
And they maybe have a smart contracts which would be a bigger advantage between these two. But Deeponion campaign is getting on my nerves, which is maybe not so relevant, but still lot of spamming from their side.