I personally have found the Graco Duo Glider to be very hard to maneuver and I HATE it!
My preference would be the Kolcraft Contours Options Tandem. It is very easy to maneuver. The seats are cool because you can face them both forward, back, or facing each other, or back to back. So if you have kids that like to play together, or you need to keep them separate, whatever works for your family. I love having options! It also has an infant car seat attachment, so you won't have to take your newborn out of their carseat.
Another options would be the Phil & Ted's inline stroller. I have always wanted to buy this one, but it is too pricey for me. It looks light-weight, compact, yet comfortable. I love the design of it, as it can be used as a single stroller, but then has an attachment for a child to sit in the back, to turn it into a double tandem. It also has a carseat adapter.
Good luck with whatever you decide!