I would say if you have cheap electricity or you are entitled to use your work PC/s for whatever purpose you need them just like I am I think for the long run Raptoreum is the best bet because it is extremely cheap,it is not yet in exchanges or better is not yet in binance and the team behind it has very clear goals,they want to solve something with it.I just made near 1000 coins in just two months with my PC-s,one core i5 8500 and one Xeon 5640 that I am entitled to use as I see fit from my work place.
Alive coin for me is only Monero but it is very difficult to make it profitable with old processors like the ones I mine Raptoreum,you need a powerhouse to become profitable with this.If you are in for the long run just help the network of Raptoreum and most probably in the future I am hopeful to see a price increase like that of Monero for Raptoreum which would make many of us millionaires out of thin air .