To me whether we run 3-4 or 4-3 is unimportant, there are elite defenses on both sides that use one or the other as their base. So you can definitely have success with either.
I just want to see someone with an effective vision on how that scheme will be executed and the right personnel in place to run it.
With our chronic struggles trying to stop the run I'd tend to gravitate a little more toward a 4-3. However, we've built around pass rushing OLBs that are going to be undersized as DEs in a 4-3, so I don't know if we've got the best fits schematically to make the switch right now.