Bitcoin will always be the best to invest during this bearish market since you won't be complaining that the price is too high to buy. Bear market will always be the accumulation phase for Bitcoin and not any other altcoins that you think could pump in the future since most of them are only driven by the hype. There will always be a right time to buy altcoins if you want to buy it somehow and mostly of them that I've seen will just pop out nowhere that you don't expect to come out.

But it's always the best choice to buy Bitcoin during bearish market than bullish market.