Coins with low difficulty, doesn't matter if it's gpu or asic, i think you should pick a coin that isnt really popular, but with high volume so when you sell the coin the spread of each buy order isn't that much.
Picking coins that are not popular will be quite a mistake. You wont make any profit from mining such coins and why would you go for such a coin when you can even mine Ethereum (ETH)? Ethereum is an all round good coin and a perfect choice both for mining and investment, anyone decide to go for and among the top twenty coins there are other coins that are profitable too.
As now you know what all is required to mine a cryptocurrency, lets explore the best coin to mine in 2019:
The truth is that crypto mining is no longer profitable as it used to be. There was a time when people can easily mine crypto with their computer cause back then it can be mined with just the CPU. But this time around, its getting difficult to the extent you cant even mine it at home, cause you will ASIC which consumes a lot of power, unless you get cheap electricity. If anyone would like to mine crypto I will be suggesting that they go for Ethereum, Zcash, Monero, Horizen, Vertcoin. If you want to go for Bitcoin, uhhhm
thats your choice.