Neurogenic claudication should only come on with walking, Prolonged standing, or prolonged extension at the waist (going down steps). The symptoms can be variable including sensation of heaviness, burning/tingling pain, or even cramping in the legs or back and doesn’t need to be “dermatomal” and is often bilateral.
Radiculopathy should present with pain going down a specific dermatomal pattern and in reality should almost always be unilateral. And the pain should be classically described as “nerve pain” with tingling/pine &needles/ burning/shooting. It may present with myotomal weakness from involved nerve root. Patients with central stenosis (claudication) shouldn’t really be weak on testing and should be relatively comfortable sitting.