I have learnt that altcoins gained are short term while bitcoin gains are long term. Even when we are near the end of the bull market, the altcoins give us good entries even at this point of the cycle how bitcoin has come far above from around 20K to 110K.
The roam for bitcoin to go above from here may be less and hence gains if you invest in bitcoin now may be low but altcoins entries now can give more profits. However, in the bear market it is best to accumulate bitcoins.
The fact is, if the bull market hasn’t ended yet, investing in bitcoin will be safer but the returns will almost certainly be lower than investing in altcoins these days. Because bitcoin has increased significantly while many altcoins have not increased much or many altcoins are still low.
Just like some people decided to take profits from BTC when the price exceeded $100k at the beginning of the year, and waited to buy ETH during the correction in March-April when the price dropped below $1.4k. They are getting compounded returns, which they would never have achieved if they had continued to hold bitcoin until now.