I don't know for sure if they are 'better' at cooling.
But after working for VW-Audi for 30 years, I've learnt that there is always a reason that parts are changed/modified in any way.
![Wink](http://cal-look.no/lounge/Smileys/default/wink.gif)
The profile is lower which I suppose might increase the internal velocity of the air inside?
![Huh](http://cal-look.no/lounge/Smileys/default/huh.gif)
I need the lower profile (less height) for my project..
![Cool](http://cal-look.no/lounge/Smileys/default/cool.gif)