Based on my experience in trading for almost 7 months now, the best coin to scalp is the newly added coins in the Coinsmarket cap and coins that just listed in the market you can buy them cheap because some of the people get that coin from airdrop and bounty so they don't care about the price they just want to sell that coin ASAP, that is your opportunity to buy it cheap and sell it when listed on good exchanges, mostly you can buy these coin from DEX exchange and small exchange