I think it is, though bitcoin should be included too.
I would only consider Ethereum & Bitcoin for long term investing. Between those 2, Ethereum is much more technologically advanced and the Ethereum network is the workhorse for a number of things besides Ethereum. It is much cheaper to utilize, and is expected to be almost free to use in due time.
Bitcoin is far more antiquated in technical terms. It doesn't do anything aside from bitcoin transactions, and while it does have a "Lightning Network" overlay that is coming on line, without that, the coin is globally limited to a paltry 7 transactions per second with 10- 30 minutes for transactions to be settled. Because of the limits, the costs for transactions are quite high making it unusable as a retail currency.
But it does carry name recognition and for that reason alone, it has about 2-3x the market cap of Ethereum.
And the lightning network overlay may solve these transaction issues by allowing far greater volume of transactions being conducted very quickly and at a much reduced cost. But who knows when that will be.