How exactly is it that you can determine which crypto is most profitable to mine? Is it by its network difficulty, hashrate, or market cap? I just want to know, now that I want to return to mine with my Gridseeds GC3355. Any help or ideas would be greatly appreciated.
Simply said: The most profitable coin to mine is the one which gives you the highest BTC amount when selling instantly.
There are several factors included like current exchange rate coin/BTC, your hashrate, total network hashrate, amount of coins per block, solo mining/pool mining and so on. As you can see, the most profitable coin for you with your mining hardware can be totally different than that of other miners.
Multipools are running a profit switching script that selects the most profitable coin each x minutes. But it is possible to manipulate it (depending of how important the exchange rate is) by manipulating the price.
There are sites like
http://www.coinwarz.com/cryptocurrency but I've read several times that there figures aren't very accurate.
To find your most profitable coin, I guess you will need to test, test and test again and compare the 24h results. For example, you would get way more Flappycoins than Litecoins, but you need to check which value, mined coins exchanged to BTC, is higher.
Maybe you would do better mining different coins you think they will increase their value, either as they are undervalued, will be pumped or publish some news soon.