To arrive at this idea, let's compare how 3 indicators are acting for each crypto currency
Cardano:
50 Day Moving Average seems to be proving as a good support
Previous high of $2.50 is acting as floor for this current correction
MACD positive
Ethereum:
50 Day Moving Average seems to be proving as a good support
Previous high of $4,200ish is acting as resistance for price, capping the current up swing
MACD positive
Bitcoin:
50 Day Moving Average seems to be proving as a good support
Previous high of $4,200ish is acting as resistance for price, capping the current up swing
MACD touching negative territory
Having a positive MACD provides a better outlook for an instrument. With that, BTC is the least preferred out of the 3
All of them have 50 Day MA acting as a good support. However, we all know that with less resistance, the stronger the situation of a said instrument is.
Having said that, out of ADA, ETH and BTC, it is ADA with the least resistance to continue its uptrend.
Summing things up with this simple analysis, ADA is the strongest out of the 3.
Good luck!