So having read a huge number of threads regarding the above topic, the general consensus I see is that unless there is a lot of climbing, aero is a better choice than light. Not looking at carbon at all so am limited to light OR aero and not both.

Now, what exactly do you guys mean by a lot of climbing. Is it long climbs on every ride? Or does rolling terrain also count? If I ride a lot of rolling terrain [so there will be plenty of ups and downs but not long or steep], would I be better of with light weight rather than aero?

Looking at deciding between Soul 2s or 3s and the Soul 4s and would appreciate any help here.