I'm just going by logs, which seem about as real-world as you can get, not sims.
Spiked Tongue seems to consistently be outperforming Wriggling, both on warlocks that have both equipped and when looking at what they contribute to outputwith just one.
I've only managed to get a Chronoshard and Stat stick myself (Albeit 850 and socketed, so I can't complain about that one), no raid drops or tongue, but everything I've looked at indicates that Tongue is outperforming Wriggling, usually by a pretty notable margin. Wouldn't be surprised if it was just a case of Tongue being tuned so high that even when you can't minmax it it's competitive / better than Sinew and when you can it's significantly so.
I don't think the passive stats are enough to offset the numbers I'm seeing, but I'm no mathmagician, so maybe my shallow trawling of logs isn't seeing something.