Solana fan Cardano for now can be said to be the best coin of choice to trade, Solana is good for the short term and Cardano is good for the long term.
I myself, if I have money and I am told to choose, I will choose both without favoring each other, 50% of my money I will buy Solanan and the other 50% I will buy Cardano.
For both communities, they are both big, but Solana is more active because currently there are many new projects being built on Solana's network.