Time to put this question to bed.I like Bridgestone more than Dunlop.Why:Bridgestone have bought me dinner twice as many times as Dunlop,Bridgestone have given me tickets to far more events than Dunlop,and more sporting goods and merchandising than Dunlop.
Hell,bridgestone is much easier to lay than Dunlop,and I use a third the blades on a whole house job with Bridgestone rubber.
But,the carpet at my house,my mum's house and my sister's house,is all laid on Dunlop Ultimate at my recommendation.It's really a no brainer.Foam retains it's "springy" qualities DRAMATICALLY better over time.I.e. most pull-ups I have done [90%] with rubber have the underlay melted literally to the sub-floor.It usually needs a complete scraping and sweep,then a vacuum before a [concientious] layer will begin work.
What's really surprising is that even the middle of the road Dunlop products out-perform the top line Bridgestone product [blue as far as I know] once the carpet has been down in excess of 5 years.
If you do the "walk on test" comparison at a retailer and choose a carpet,place it on top of both Dunlop Ultimate and Bridgestone Blue,and you will almost certainly agree that the rubber feels softer/better.
You bet it does,cause it IS softer and will break down sooner.
So if I was laying carpet at Joe blogs house for a laying service,I wanna be using Bridgestone,If it is a private job and the installation comes back to me,I'm only recommending Dunlop.
This is not conjecture,it is fact and every carpet layer knows it.The only reason to choose rubber is it might be $1 cheaper and oh yeah,rubber is a sustainable natural resource...........