Yes I've personally tried both the regular Jalapeno peppers and the Poblano Peppers and in my opinion the Poblano pepper is much hotter than regular Jalapeno peppers so if you try some be prepared for a hot mouth that needs cooled down.
There are other hot peppers out there though that are even hotter than the Poblano Pepper but the Poblano Pepper really does pack a punch and is much hotter than Jalapeno.