What's harder, passing a "prop firm" challenge, or keeping the account?

What's harder, passing a "prop firm" challenge, or keeping the account?
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The challenge is a onetime deal while continued profits from a funded account is an ongoing affair.

Keeping the account is going to be harder from a statistical standpoint, but I'd argue neither should matter. If you ran the numbers to make it near impossible to blow the account, then it's just a matter of sticking to what works.

Easiest example is I trade 0.1% risk per trade. Why? Because my risk of ruin is extremely low. "But your profits also suffer!?" people say. Well, no. Because