4 Link Vs 3 Link. My 2cents super six save reply Obviously it also depends on what you can fit under the vehicle.
Either will flex just fine if designed properly. Both 3link and 4link (and 4bar and ladder bar) can be adjusted to cancel the unloading of the right rear due to driveshaft torque, but the 3link is the simplest to implement. Go with a ram set up like the one from agr.
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A 3 link is obviously simpler to work around, and you can really mess things up when you start moving too many things around on a 4 link 9so take notes when you tune) also, alot of the earlier low cg servo/battery plates did not have provision for a four link setup. A 3 link is easier to package (one less link, duh) but the fact that there are regularly available 4 link kits out there kinda shows us it hardly should be considered an issue. The 3 linl is easier to fit around engine/exhaust/etc. Either will flex just fine if designed properly.