BTC
If you have study, the entire market in the past few weeks you will discover the cryptocurrency market is a system, and this system works together in terms of market value, but at some point, some cryptocurrencies perform more than others e.g. Bitcoin which is the dominant cryptocurrency. Bitcoin at the moment is in another bullish position while other altcoins, except a few, are in a downtrend mode this leads me to the conclusion that Bitcoin is the most Bullish crypto at the moment.

free to add your opinion on this, but the view should be limited to 2021 alone.