Yes, Bitcoin and Litecoin has power. But I advise you to invest in Ethereum, as it becomes more promising. It has more advantages than Bitcoin.  For example, the same high speed of transactions, the MetaMas application, the award for Ethereum for miners does not decrease with time, in Bitcoin every three years it is cut threefold. Time and volume of extraction of production in the Ethereum ecosystem are not limited, the Ethereum mining outside the pool with own resources is still a reality and etc. Ethereum has more chances to overtake Bitcoin in the near future. Based on these indicators, the project Estate Coin (real estate) decided to still use Ethereum. The project is promising and unique. Tokens that are realized within of the ICO campaign will give an opportunity to receive income up to 36% per annum in the crypto currency (in bitcoin or up to 270% in USD, this income can be during the period when mining equipment works). Tokens are provided with real square meters of built residential real estate. If you are interested in the project can read here https://estate-coin.com.
Good luck!