XS LDFs - curve fitting

[The Mantastic Actuary]

When creating excess LDFs, is there a specific curve that anyone feels fits the data better than other curves?

Specifically, when using ResQ, I am given the option between exponential, inverse power, power, and weibull. We generally use the inverse power curve since it is the default. However my boss was wondering if we have a reason for that (other than it is the default and that was the curve of choice prior to me starting at the company)?

So if anyone can help validate the choice or give me any reasons why another curve would be better it would be helpful.

Thanks