FNILX vs. VOO: Which Fund is Better?

Someone asks:

Hi all, has anyone compared FNILX (Fidelity) vs VOO (Vanguard) and found a reason not to purchase FNILX? Both follow S&P 500 but FNILX is newer and has zero expense ratio.
Iโ€™d have to start a Fidelity account to purchase…

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