Different tires are made for different markets. Different advertising programs are also targeted for different markets.
I don't claim to know each model of tire that is released in all other markets around the world.
Concern yourself with what is available to you in your region. I am certain that the top of the line Dunlop offered in your region would be a top performer. Trying to compare the offering of 1 region to the offering of another region will send you off the deep end. Much like bike models, what is offered in UK or EU is not what is offered in the USA. This does not mean that the manufacturer is trying to short change 1 region, its a matter of what the customer in each is going to buy. Often they are the same bike with a different color scheme.
So consider if you are in the UK and the SportSmart is available to you, then try them. If you are in the USA, the offering is the Q2, so try them. You have not tried either, so stop reading everyone's evaluation of the tires and try them for yourself and you be the judge. Don't think you are getting short changed if you read the rave reviews from one country and can't get that tire. Get the tire that is available.
Dunlop does not make a "good" tire for one county and "lousy" tire for another. The products are constantly getting better. When one factory makes a better tire the other factories use this advancement for their next model.
Also consider the cost. When you ship a tire manufactured in UK to the USA, there are shipping charges and currency exchange rate that need to be factored in.
Additionally, if you are in the USA, you must have read the rave reviews the Q2 has received. I can't imagine you are holding off on trying the top of the line Q2 because you hear the grass is greener on the other side.
Thanks for your reply.
I am currently on a "world tour" by using a different set of tires from each mainstream manufacturer. I am currently running Mich PP2CT and am pleasantly suprised (didn't like , the previous Bridgestone 016, heavy turn in effort and wore waaay too quickly). I have a set of the new Pirelli DRC's waiting in the wings for spring season. By mid season, I will likely try a set of Q2's if the SportSmarts do not arrive here (Canada).
Cheers.