Serious reply, if I had to choose an anonymous tech my answer is Monero XMR.
If there will be no other option for OP, I'll choose ada and grin and it's going to be $500/$500. But if he can consider other coins, I'd like to suggest Monero too.
I don't agree about the choice of coins but you're right, it's never wise to spend all your money on a single crypto, diversificating is better most of the time to try avoid some risks.
Couldn't agree more, diversification is needed and it's a must for every traders or investors that are looking to the market.