Ergo Metro 3 vs Mockingbird Travel Stroller Comparison! These two travel strollers look so similar on paper, but have some key differences! A few things to note - - Both brands sell a lot of accessories including a snack tray. - Mockingbird has an easy to use carry strap and more included for the price. -Ergo Metro 3 does have a carry handle on both versions and a strap on the deluxe, but it is not super easy to get to. -The unfold on the Ergo does stick a little. -Ergo Metro 3 has a 1 inch taller seatback (21 in vs 20 in) For the Mockingbird, use code EMSTROLLER for a free rain cover with your stroller. For the Ergo Metro 3, use code StrollerM15 to get 15% off!