Financial agreement

I am currently waiting for Decree Nisi and am trying to agree a financial settlement with ex.we have been married for 16 years and have been together for 23. We have two children aged 14 and 17 and have separated in Jan 2018. We are both still living in the marital home as my ex won’t move out until we have a settlement.
We have £110k equity in the house and pensions. My CETV is £484,000 and his is £650;000. I earn around £55k and him £50k. He is due to retire in less than 18 months and will receive a lump sum around £170k. I have longer till I retire around 8 years. The children will love between the two of us which we will share although it is likely I will have the, more as he works 24/7 shifts. We have agreed for me to stay in the house . My legal advisor has suggested that all the matrimonial assets should be added together and split 50/50. That would effectly mean me keeping the house and my pension and my ex keeping his pension as it is more valuable. He is not happy with this and is demanding his pension and 50% of the equity. I want to be fair and would really value some advice as I really don’t want to have to go to court.

Please see answer to duplicate question.