If you want variety, here's the ranking:
- Binance: 350+ coins. Best for altcoins, especially new listings
- OKX: 320+ coins. Good selection, strong for DeFi tokens
- Bybit: 280+ coins. Fewer altcoins but better for futures
Where to find new coins:
- Binance Launchpad — new projects launch there first
- Check "New Listings" section regularly
- Follow exchange Twitter accounts for announcements
If you're into small cap altcoins, Binance is the place. But be careful — new coins can be very volatile.