Negatives include administratively complex and costly to establish. The company must be a certain size (usually $1 million-plus payroll) for a leveraged ESOP to financially work and requires significant employee education and engagement.
External transfers can include selling to a third party or recapitalization.
Sell to a third party. Positives include the fact that in a promising merger and acquisition environment there is rich valuations and equity ready to be invested. You will have a clear exit from business. Negatives could include the emotional strain of exiting, and your business may not be as valuable without you.
Recapitalize or sell a majority or minority interest stake in the company. Positives are that this keeps you involved and restructures the balance sheet to create liquidity for investments in growth or distribution as dividends. Negatives include potential conflict with new investors, and added debt that may cause a drag on future business performance.