Deciding whether to accept an offer that is subject to sale in South Africa depends on several factors, including your individual circumstances, the current real estate market conditions, and your level of urgency to sell the property. Here are a few considerations:

1. Market conditions: If the real estate market is slow or buyers are scarce, you may want to consider accepting an offer that is subject to sale. This allows you to have a potential buyer in place while continuing to market the property to other potential buyers.

2. Timeframe: If you are not in a rush to sell and have the flexibility to wait, you may prefer to decline offers that are subject to sale. This is because such offers are contingent upon the buyer successfully selling their own property, which can introduce uncertainty and potentially prolong the sales process.

3. Financial implications: Consider the financial impact of accepting an offer that is subject to sale. Ensure that you have a clear understanding of the buyer's financial situation and timeline for selling their property. If their sale process is likely to be lengthy or uncertain, it may affect your own financial plans.

4. Terms and conditions: Carefully review the terms and conditions of the offer, particularly those related to the buyer's sale. Clarify any uncertainties or seek legal advice if needed to ensure you are protected and your interests are covered.

Ultimately, the decision should reflect your specific circumstances and priorities however it may be helpful to consult with a real estate agent who can provide guidance based on your individual situation.