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of course BTC will be the first choice as an investment because it has been widely believed by everyone the second is ETH and ADA which in my opinion still have very good potential in the future
ETH is another Good idea but ADA?i don't think there is a bright future this soon for this altcoin,its been long that this currency grow and now still continue to fall.little by little of course.
I supported what you said because ADA is just ETH competitor in the smart contract business and the last time i checked none of the altcoins that compete with ETH in the smart contract business thrive and have much support from crypto community.