Word opposite of risk but still entailing uncertainty

Opportunity is another one.

Antonymous meaning is evident in phrases like: "risks and opportunities".

Yourdictionary lists these synonyms for opportunity: chance, occasion, suitable circumstance, juncture, opening, excuse, happening, contingency, event, befalling, probability, fitness, fortuity, good fortune, luck, hap, fair go, break, even break, shot; some of these have positive connotation and might also apply.

A nice word could be:

Prospective

As in:

"Being a manager of this branch is prospective indeed."

A chance is a possibility that something happens; it's not used in negative sense as risk, but still it's not a certainty.

Our football team has a chance of victory.

I don't think there is an answer to this question as asked, because it assumes there is a "zero level" above which all outcomes are good, and below which all outcomes are bad. The marketing industry would like you to believe this: they will happily sell you a 'guaranteed winning ticket' that will entitle you to a negligible prize. But in the real world, a loss avoided is a gain (if your investments lost only 5% when the rest of the stock market lost 25%, you were lucky or skilful), and an opportunity missed is a genuine loss (keeping your money under the mattress costs you money at the rate of inflation). So risk, gamble, luck apply as much to good outcomes as bad ones: the trick is to choose which risks you take.

Risk averse is often used corporately. The betting industry has many terms such as odds-on, dead-cert, risk-free but the accuracy of these claims are often suspect.