So, what’s the best ETF for the S&P 500 index?

There are tonnes of them: IVV, VOO, SPY, FXIAX – how do I pick one, and does it really matter?
From what I’ve seen of Reddit, people really like VOO.
The most popular of them is SPY, though.
So, what’s the best one and why? What are the differences between them? Are there more ETFs?