If you had the choice to buy only one of the two today which 1 would it be?
Monero or LTC? don't really need brains to decide on this

I think monero is the my first choice from the two listed coins. There is stability in the coin and I have seen the accelerating growth in the Monero as compared to litecoin. The matter being in the earth since long time still have not able to generate that much market cap if we compare with short period of time for the monero. So with that comparison also monero will go upwards and can bring more profits as compared to ltc.