There are a number of 'depends' to that question.
is it weight that you want 'not a lot of' or doesn't that matter ?
Is it 'noise reduction' you value most ?
Length in front of the barrel ?
Amount of barrel available to slide the vertex style moderator over ?
What sort of cleaning regime do you envisage, do you want a moderator that breaks down into pieces or one that is sealed ?
Do you want one that you can add additional baffles too or change the bridge so that you can use it on different rifles ?
How much radial clearance do you want between the moderators bore and the bullets diameter ?
How big (or slim) do you want the moderator to be ....
Is this for range use or field ?
What about cost ?