Is there any good platform whereby i can compare endowment and annuities plans from different agent? looking at Aviva alongside GE retirement plan

https://www.comparefirst.sg/wap/homeEvent.action might be a good place to start, however it might be a bit of a rabbit hole if you're not trained to understand what the various T&C entail.

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Might be worth engaging representatives from each insurer to provide quotations instead, as aggregator platforms like these may not be as updated with the latest promotions and pricings.

You can consider using Policypal. They are an insurance broker and would give an overview of policies and don't represent any agent in particular: https://www.policypal.com/ppfa/endowment-plans