If you consider the actual travel time, its not much difference.
For an example:
Based on google maps:
Assuming you leave at 7.30am on a weekday:
Ecohill Welcome Centre to KLCCDistance: 43.3km
Travel Time: 50 mins to 1hour 50 mins
Jade Hills to KLCCDistance: 32.4km
Travel time: 50 mins to 1hour 50mins.
So distance is around 10km further from KLCC, but travel time is the same (due to direct highway connection for Ecohill). So now you might say the data is wrong and what not, the next best alternative to this is to drive yourself and compare la (this one can vary from person to person depending on travel speed, whether use emergency lane during traffic jam etc :-)
However, if you compare the price difference between these two areas. 2 storey house in Jade Hills equivalent to Semi-D in Ecohill...or 2 storey house in ecohill same price as condo in jade hills..
That's why I said semenyih has a better value proposition..
Lu ini macam cakap. I can confirm got one person sure sibeh bo shiok.