what's alternative coin which better for mining?
some new altcoin that are launched every day on the altcoin section, have very low diff, otherwise you can try to mine dash with gpu or monero, but thy aren't that profitable like in the past, nonetheless they should still offer a better profit than mining bitcoin
It is important to note that many of them are pump and dump scheme. The price may just crash when you try to cash out. It is quite risky. If they are really profitable for a long term, the old gpu/cpu miners would be mining on the coin thus rising the difficulty.