My preference would be to use the UAE board first, with one obstacle: broad Dubai figures will not tell you much about a particular detached home. Fix the area, property type and time period before gathering advertised and completed prices.
That gives you a cleaner price comparison, but it...
The practical issue is finding a plan we can leave without excessive cost or difficulty if it stops meeting our needs. I am comparing property management tools for Dubai, and I would like to know whether any legitimate UAE professional, association or community discounts are currently available...