Disclaimer I hold the following BTC, ETH, ADA GNT, IOTA, CRPT, STQ & TRX and these are my opinions only
My 3 favourite coins :
My favorite would have to be IOTA for the future and is a long term hold and contrary to common belief the coin is not just for IOT/M2M transactions but also P2P. Bosch partnered with IOTA. Early days but will be huge in the coming years. Free transactions and no Mining and transactions will only get faster and faster as more trasanctions are made on the tangle. They need a good wallet ASAP !
Cardano - ADA Ethereum killer please research this coin. Pretty amazing
Storiqa - STQ Still in ICO phase until Feb 13th and can still be bought very cheap under 1c +% bonuses.