Hello. The stroller situation has been a hot topic at our house too.
I haven't had my boys yet, so I can't say which stroller is the absolute best, but my husband and I decided we just wanted to buy one stroller that could be used when they were infants and when they got older....so, after much researching we went with the Kolcraft Contours Tandem stroller. It can accommodate two infant seats (it comes with one infant seat attachment, but you have to buy another for twins), but should also work when they are older. It seems to fold up nicely, and whereas it is bulky, I don't think there are many double strollers that are not.
In the future, I imagine we'll look into finding a double umbrella type stroller, or maybe just two cheap umbrella strollers for light trips and such.
With my 1st set of twins, I bought the Kolcraft double stroller.