I find NQ much easier to day trade, of course with NQ you will lose or make roughly 30% more than trading ES on a 1 to 1 ratio. But NQ will normally give you more outs than ES in my experience (if your style / strategy isn't just a single entry with set stop and profit target).
Trading is very difficult, but also people make it more mysterious and harder than it has to be. There's so much misinformation and negativity out there that it's ridiculous. Even traders way better than me give information that is incorrect and damaging, but people assume because they are profitable that they must be correct. There's so many different ways and styles to pull money out of the markets.
It's funny though some of the same people that claim you can't predict the markets, tell you to use a stop and set profit target..... if that is consistently profitable than it proves the market is predictable to some point.
All trading is about is can you get your contract from point A to point B without it going to C. You can do that by having extreme market knowledge and great tools, you can do that by having large size and pushing the market around, you can do that by having a simple strategy that you just repeat over and over knowing that if you apply it 100 times you will come out profitable.
You can even have a strategy where you average down (knowing if market doesn't hold here it's going to go down one more deviation) This allows you to pre-plan your averaging because you know if market moves down X amount on this time frame it normally moves up to Y, but if that doesn't happen it will likely go down to the next deviation and so on.
Simple method repeat and often avg in with 2 positions, can't predict price accurate enough to know when it'll turn back with trend so avg in makes sense.