99.9% of altcoins have no reason for existing beyond pump and dump speculation. Bitcoin would be your best bet.
there are several examples of altcoins rising very high in 1 year. such as XMR increased to over 0.02, ETH, EGC and others.
but indeed it is difficult to determine a good altcoins for investment within 1 year. altcoin is trading short-term and long-term better hold bitcoin.