Honestly for me my preference on either bull market or bear market depend on the coins and the given situation. For bitcoin, I definitely prefer the bear market because I'll get the opportunity to buy and it will be a period for easy investment because I don't have much in my portfolio. But for altcoins which I have made more investment in, I prefer the bull market because that's when i'll be able to make profits. But for people who have definitely accumulated both bitcoin and altcoins, they'll definitely prefer the bull market period.