To avoid wasting time and resources, there needs to be clear criteria for selecting the best ideas. The most widely used criteria is the so-called ICE-score, evaluating an idea on Impact, Certainty and Ease.
Other criteria that you should consider when evaluating ideas are how Useable, Stable, Creative, Radical, Scalable, Sticky, Profitable, Focused, Actionable, Implementable or how Aligned an idea is on a scale from e.g. 1-5.
In most cases evaluating ideas on more than 3 criteria is not practicable for the idea evaluators.