What is better than endowment plan nowadays? Best firms to buy investment policies to grow wealth in good health?

I don't think there are other investment solutions that contain a capital guaranteed portion that endowment plans typically offer. If you're looking to grow your wealth and you can tolerate volatility, then DIY investing by buying a global index ETF like VWRA or investing through a roboadvisor would be more cost-efficient.

If you want to preserve 100% of your capital, I think endowment plans are your only option. That being said, some endowment plans do not guarantee the full amount, sometimes just 80-90%. So read the fine-print carefully.

Endowment plans also invest in the market so technically, almost anything is better than an endowment. The only benefit. Of having an endowment is that they will usually have an assured sum. But the company already knows that over the time you are holding the endowment, 90% of the time they will make way more.

ILPs are probably just as bad even though many 101 ILP have multipliers now due to the fees.

If you have a 5-10 year horizon, you'd be better of using a robo-advisor or DIY.