What exactly are you looking for? An investment? A store of wealth? A quick trade?

Altcoins are good for quick trades to gain profit but I personally am a bit wary of holding money in any of them for very long. They tend to depreciate over time. They're also quite vulnerable to hacks and can easily be taken over. They're not exactly the safest asset.

Bitcoin, however, has a longer term security that is promising. I'd be comfortable leaving my money in there for years. No one is going to attack it, and it's decentralized. What more can you ask for?