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1. ETH
2. BNB
3. Arbitrum
4. Cake
5. ApeCoin
If I will pick on the 4 coins that you shared (ETH is excluded), I will choose BNB for sure.
Arbitrum is just a hype because it became a successful project after it's airdrop (and more airdrops in the future). As for the 2 coins, I held CAKE for quite some time, and ended up with a loss, and as for ApeCoin, didn't bought it as well because... nah I'm focusing more on the top coins.
As for my answer to your question, no doubt it's Ethereum. It's kind of ironic on my part that I'm picking Ethereum, but that isn't the altcoin that has the most percentage in my portfolio.
Anyway, I guess there's no need for an explanation as to why Ethereum. It's the 2nd largest coin in terms of market cap, has been there for a very long time, survived multiple bear markets already, and the development, and the upgrades towards the project is still there. It's also the leading smart contract platform still even though we've seen many altcoins that has the same features.
I think many here also pick Ethereum as well. Aside from Ethereum, I guess I'll go with BNB and Cardano as well.