Your best coin could be Litecoin.
The coin is considered as silver to bitcoin's gold. With its blockchain of 2.5 minutes, the coin makes transactions four times faster than the pioneer and is also present four times the amount of Bitcoin's limited 21 million. Since Segwit activation, the transaction speed has increased much more. The coin stands strong at $7.8 billion and has the potential to cross the $500 mark by the end of 2018. It has one of the best development teams behind it as well. Hence, you can expect good returns from the coin.