Co ops are usually cheaper for comparable space. That is the first thing everyone notices and the last thing that should decide it.
What you actually own. In a condo you own real property, a deeded unit. In a co op you own shares in a corporation and a proprietary lease for your apartment. Every structural difference downstream comes from that one distinction.
Approval. A co op board can interview you, require extensive financial disclosure, and reject you without stating a reason. Boards commonly set minimum down payments, often twenty percent and sometimes far more, and require post closing liquidity, meaning cash left over after the purchase. A condo has a right of first refusal and, in practice, a much lighter process.
Monthly cost. A co op maintenance charge includes your share of the building's property taxes and any underlying mortgage on the building. A condo common charge does not, and you pay taxes separately. Comparing a co op maintenance to a condo common charge without adding the condo's taxes is the most common mistake in the comparison.
Subletting. Most co ops restrict it heavily, sometimes to a couple of years after a waiting period, sometimes not at all. Condos are generally far more permissive. If there is any chance you will move and want to keep the apartment, this is decisive.
Resale. A restrictive board narrows your buyer pool when you sell. Foreign buyers, buyers purchasing through entities, and buyers with strong income but thin liquidity all lean condo. That narrower pool is a real part of why co ops trade cheaper.
When a co op is the right answer. You are buying to live in it for a long time, your finances are clean and documented, you do not need flexibility, and the discount is large.
When a condo is the right answer. Almost every other case, and specifically any case involving new development, uncertainty about how long you will stay, or a plan to rent it out later.
The discount is real. So is what you are paying it for.
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