I'm going to ask a noob question here as I can't really find a solid answer. I've referenced the site whattomine to check profitability of mining different algo's/equipment/etc, but I am questioning the accuracy of it's estimations. For example, if you were to put in the specs of an S9 and check current profitability at the current difficulty it has BTC as the 6th most profitable SHA256 algo. Obviously these results fluctuate constantly due to many factors and the filters you select, but it just doesn't feel like an accurate estimation is being portrayed.

Over the past month or so that I've been mining and looking at the site its show than mining via NiceHash was almost always more profitable than mining BTC. I mined on NiceHash for about a week and if I compare my BTC per TH/day to what the forum members reported as their average at Kano pool over the last 3 months (when luck was pretty bad for the pool) mining with at Kano was much more profitable, by something like 30% even with the run of bad luck/difficult blocks.

I guess my question is how much trust should one put into a site like whattomine and how do you truly calculate what the most profitable use of your mining power is? Currently the site is showing BCH as being $0.45 per TH/day more profitable to mine than BTC, but it also says NiceHash is $0.25 per TH/day more profitable than BTC which I know is a fallacy.

If someone can chime in with some more information or point me towards some resources that can provide me better/more accurate info/estimations it would be greatly appreciated and likely useful to more people than just myself.