This is sort of like the tastes great less filling debate, both side of the debate have merit.
Unfortunately there is not a black & white right answer.
The simplest way to look at it is the sort of surface you're going to play in.
The taller skinny sizes will cut through the mud seeking a solid surface beneath to grab a hold of, this is great if the mud you are in has a bottom!
The wider sizes will offer more flotation resisting cutting/digging through (or sinking) to the bottom, allowing you to do a better job of staying on top of it.
The various tread designs that exist in mud tires have one thing in common as they are designed to work like a football or baseball shoes with the cleats penatrating into the surface to provide grip. This is pretty simply a matter of having more void or open space than rubber contact between the surface & the tire.
What does vary quite a bit is the tread designs ability to clean it's self out in the mud. Add to that there are vastly different types of mud out there to challenge us. There are a few little differences that tire companies use to improve this ability like the pitch angle of the tread blocks or something in between the tread blocks to break the vacum holding the mud in.
There is the sticky clay that as you try to walk through it you just get taller as it sticks to the bottom of your boots, to the stuff you sink in past your knees & sucks the shoes off your feet as you try to take the next step.
Another thing to think about is how much time you'll be on the pavement, some mud tires while great in the goo are less than terrific on the road offering lots of noise, mushy handling & irregular wear, etc.
Bottom line ask lots of questions, think about where you go wheeling before racing out & spending money on tires that may not be what you want to live with for a few years.