if talking about meme coins, then we can compare doge coins and shiba coins. of course shiba has a very large supply of coins compared to doge. so it is very unlikely that Elonmusk keeps shiba, as far as i know shiba is just hype coins and nothing more.
and I think BTC has become the main asset priority that Elonmusk has. moreover he owns a Tesla company and he also accepts payments via BTC.