Wyllie time-average equation vs Gardner's equation vs RHG Equation

[srawal]

If you were estimating porosity from velocity, which approach would you prefer to use among Wyllie time-average equation, Gardner's equation Or RHG Equation, when and why?

My answer is RHG equation as wylllie equation don't work for unconsolidate sand and give accurate results when it is saturated with brine solution. Garnder's equation mainly relates density with porosity not accounting with velocity and RHG equation is improved one. CAn you please help me with anything i'm missing here.

Also are imbitition method, mercury displacement method and ideal gas are also alternative method to calculate porosity which is same above three equations to calculate porosity ? or am i missing anyting?