What is your purpose for signing into an endowment plan in the first place? Saving up for a big ticket item down the road? Retirement? Or just a form of "forced" savings?
Personally, I won't recommend getting into endowments or any retail wealth management products out there, including ILPs/unit trusts/mutual funds. They cost too much to put in and you get paltry returns in the end.
As alternatives to endowment plans, considering buying into Singapore Savings Bonds, or leaving a standing instruction to "force transfer" a sum of money each month into an account giving higher interest, such as POSB's SAYE, CIMB's FastSaver, or Citibank's Maxi Gain. You can also buy into a bond ETF through POSB's Invest Saver programme each month at minimally S$100.
Hope this helps.
Compare between SSB and Endowment Plans here, then think critically for yourself, before making a decision.
An article I wrote myself to educate Singaporeans about SSB vs Endowment Plans: