How to compare mutations
Start with the multiplier shown in the in-game item panel, then compare it with the base income or value of the Brainrot it is attached to. A strong multiplier on a low-value drop can still be less useful than a smaller bonus on a reliable high-value drop.
A simple farming routine
Keep your best confirmed earners, use duplicate drops for testing, and recheck the panel after every update. Mutation names, values, and availability can change, so treat the current in-game description as the final source before trading or replacing an item.