Former means the PS client determines IR35 status and any liability of them getting it wrong lies with not you, though I think that has yet to be tested out during a HMRC investigation and subsequent court case in regards tax due and who pays it in the end.

Latter means it's up to you to get evaluated by contract review (as you have done) and try to change terms/working practices to be outside IR35 as others point out.
So depends on who the client actually is. If the contract is with the 'firm you are working for' and they are delivering a product to the PS rather than you engaging in daily activity as a 'bum on seat' with the PS then you have more leeway to try to position yourself outside IR35, which can be done even after the contract has started if you are able to adjust the actual working practices sufficiently then get another contract review done.
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