Cardano emerged back in 2015 and presents today a strong contender in the smart-contract arena. Similar to Ethereum, developers can create smart-contracts for their DApps. On the other hand, Cardano is highly scalable, and is able to process more than 250 transactions per second, versus Ethereum that currently does around 15 only!
This solves the major obstacles...
I do believe that Proof of Stake cryptocurrencies are the BEST choice for investors based on my years of experience. There are three major reasons:
Staked coins discourage selling pressure and hold the price of the coin up
Staked coins benefit from compound returns
MOST IMPORTANT REASON... watch to the end!