I agree with Ron. The Engr. Consulting firm i work at deals with these types of claims (not me personally) and it is always engineer vs engineer. I think the assumption is that architects don't have the training to measure heights, slopes, traction, and then analyze the results like an Engineer. I mean architects just pick out colors and move our bearing walls after we design the structure for fun, right?!?
My boss considers himself a forensic engineer. He is licensed (PE) but all he does is correct and comment on things architects and other engineers do wrong. He dabbles in Arch, Struc, & Mech. and is rather gifted in all three when it comes to specific details. We have done abut 3-4 trip and fall claims in the past 5 years. Pretty rare.