I don't think you are getting conflicting advice - I think you both just see things very differently and that is being communicated to your solicitors.
Without knowing the facts of the case it is not possible to offer any meaningful advice but in general any settlement should be based on what a court is likely to order.
In Court, a judge will look at all the facts of the case, the ages of the parties, their capacity to earn into the future and, indeed, former lifestyle. I take the view that a Judge would take a negative view of a spouse wanting to be maintained in a lavish lifestyle IF the other spouse's financial position had deteriorated significantly but that does not appear to be the case here.
In the end, if the parties cannot agree and are poles apart, go to Court. Its the only way you will both be satisfied . But that is expensive and you should take that on board also.
Very often the most significant issues in a matrimonial cases are widely differing views on respective responsibility, the length of the marriage and the degree of dependency on each other, downright meanness and outright grubbiness. I am still coming across cases where people accept there is a downturn but do not think it should affect them. Go figure
mf