I've tested both BTG on Supernova and ZEC on Flypool. I am making way more with ZEC than BTG. Flypool dominates ZEC, whereas BTG doesn't appear to be finding as many blocks to make that actual revenue I see on a 24-hour basis top ZEC or even come close to WhatToMine estimates.

I did roughly $60/day on ZEC and $45/day on BTG. In the last 24 hours, Supernova found 51 blocks of BTG and Flypool found 240 blocks of ZEC.

Plus, I believe in ZEC long-term more than BTG so there's even more incentive to mine it. Using WhatToMine is only good for broad estimates. Your real revenue is still based on the performance of the pool you are mining with.