Chances are you can make more money in a bull market. But if a person has trading experience and a clear strategy, then he can earn no less in a falling market. Especially good is the trader who conducts constantly active trading in both short and long.
There might be equal chances to make money in both of the market directions but you always need to be a versatile trader otherwise unlike you mentioned the more chances in bull market cannot be possible. But, I agree cryptos are known for holding to make easy money which means you never need to be an active trader to make money but during bull market all you need to do is simply buying and holding.
Bull market is the preferred one for crypto people as we are all following holding way of trading. It became possible due to the reason of cryptos are in early stages and still unfolding its potential slowly to its investors.
The idea of hodl is only applicable when the market is in uptrend. There are market cycle and it consists of uptrend, downtrend and non-trend or the sideways. When the trend is uptrend, we will see higher highs and higher lows where the price is continuing to increase and it is the best time to hold cryptocurrencies. I do not know why there are posts that saying continue to hold even if the market is bearish where the selling pressure is high and the price is gradually decreasing.