Leasing allows you to retain ownership of the mineral estate. You receive a signing lease bonus (one-time payment per net acre) and a royalty interest percentage (e.g., 20%) of all produced hydrocarbons, paying nothing for drilling costs. If a commercial well is completed, the lease is held by production (HBP).
Selling involves transferring the deed of your minerals permanently in exchange for a large lump-sum payment. You forfeit all future bonuses and royalties but guarantee your payout immediately, eliminating geological, operator, or price risks.
Leasing generates slow cash over decades, carries high price/geology risk, and is taxed as ordinary income. Selling provides an immediate lump sum, eliminates asset risk, and is taxed at favorable capital gains rates.