Seems to me the items that stand out the most are:
Regular Sway Bars-Type?, Size?, Adjustable Yes/No?
Splined Sway Bars (What kind and size, solid or hollow? Is there a choice in size?)
Rack and Pinion Steering (Except most don't mention the available ratios for them) Some Racks are mounted BELOW the frame for lower cg, however does that put your Rack in such a location where debris will hit it?
Weight vs standard subframe for each one
How much adjustability there is in setting the Caster/Camber etc for each one frame?
Price
Maximum Wheel and Tire width WITHOUT rubbing!
All have coil-over springs. What are the spring rates they use and what type of ride/purpose are they trying to achieve? (I know it depends on the weight of the engine, however that in mind aren't they still chosen for a specific type of ride?)
Double adjustable shocks
Do you need custom headers for the frame or will standard one work?$$$
Dropped Spindles VS Dropped Springs (I think I've read that dropped springs are more desirable) Please check this out by someone else. In any event there is a difference, and what is the difference?
Do you use Standard Metal Body Bushings or the Low metal body bushings to help lower cg? If you use the lower does it mess anything else up regarding fitment of the rest of the parts?
What Test have been run on these frames vs. the standard frame with Hochkis Arms, sway bars etc. Was there a difference? if so, how much, and why? Is the % in change worth the extra price of the new frame?
Martz is the only company that has several frames, each designed for a different purpose. Is the difference note worthy, or a marketing angle?
Are any of the frames truly superior to the others or at this level is it a matter of what style do you like the best, or which is the cheapest?
I hope not, but I don't know. Wish I did because it's a pretty big chunk of cash for any of them, and a lot of installation time. And to top it off the original subframe is already installed and waiting to be upgraded.
I know this is blunt, "but inquiring minds want to know!"
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