I agree with the mom that said to check them out. I have both types. A Graco duo and a double jogger(don't know the brand, but it's great!). The jogger is much easier to push for my husband and I both. However, you can't put a baby in one, so we used the duo for the first year with the second and third babies. I always put the baby in back and the toddler in front, but I see a lot of people with them switched at the mall. Once the toddler hits three - it gets hard to push. (I should have shopped around and bought a better double, but I had a gift card to Target and this was the only one they had!) However, there is limited storage space on the jogger, so it's hard to take to the zoo, mall, etc.
You might also check USA Baby in Arlington - they have a lot of higher-end strollers. Spend what you can - it does make a big difference unfortunately.