No doubt it's Binance coin BNB.

I mean it's the largest and most popular CEX currently, and with many features on the exchange that you can use, it's no doubt why it's on the top right now. Although I'm not a fan of holding exchange tokens, if you're thinking of holding for an exchange token then Binance Coin would be the top choice. The Launchpool feature is just amazing, and knowing that we are in for the bull run (hopefully), many new projects will be launched on the Binance Launchpool, and it's like you are getting free tokens just by staking your BNB token. Low Risk, possible high reward as long as you are holding lots of BNB, it's totally worth it. Tried it with 1 BNB when they launched Manta Network and Altlayer, and I would say it's kind of meh. I didn't have that much money at that time so I only got a few. Of course, the whales will be the ones that will benefit the most from it.

Overall, it doesn't mean that BNB is the only coin that you need to invest your money in because, after all, there are many exchanges out there who has their own native coins. The one that's becoming more popular right now is Bitget. Maybe you can try to invest on that as well. Then there's Kucoin and OKX out there as well.