I'd say Argo is the most profitable right now. 50~ coins per day with 9 1080ti, 0.013~ btc
how i calc argo coin profit i have 12 gtx 1080 ti and 7x gtx 1070
My neanderthal method is to just mine for a couple hours then multiply
But you could try something like this equation https://bitcoin.stackexchange.com/questions/8568/equation-for-mining-profit