Both Sun Life and Pru Life are top players in the insurance industry. I used to be with Philam though :) I suggest that you list down your preferences and priorities before getting an insurance and look for a good and reliable insurance agent. Most companies offer flexible plans and can adjust according to your needs. It's most important that you deal with someone whom you can trust and understand your needs so he can give you the best advice on what plan to choose.
We have family insurance plan in Sunlife and we're satisfied with it. So far, no negative feedback on them. We also inquired at Pru and Manu, but Sunlife we think offers the best so we took them.
You might want to consider Prulife Uk. It offers flexible plan and can be customized according to your needs and financial goals. I can help you out and give you advise on this.😃