Doona is not meant to be a stroller. It's very bad for the babys back if you use it as one.
I know a two year old that's back of head is totally flat from spending too much time laying on his back in a Doona.
Seriously, you need to consider your lifestyle to come up with which stroller is right for you.
Do you have a lot of steps? Some strollers are easier to get up and down steps. Bigger wheels, different lengths work for different steps... Some can take the abuse of steps, some will break before the babies birthday.
Does it fit in you elevator?
Will your wife be taking busses or taxies? Busses: Some strollers are easier to get on and off busses. The width of the stroller can be the difference between being able to take it down the aisle and a seat or being stuck standing by the door (in everyone's way). Taxies: A stroller that can be folded with one hand while holding the baby is ideal. A stroller that you need two hands to disassemble to fit in the trunk of the taxi when theres a line of cars honking, can be difficult and very stressful...
How do you do your shopping? do you need a large basket to hold your shopping or do you have a different way to get it home?
How much room do you have in your apartment? A small dira gets even smaller if your stroller is in the way.
How much space do you have to store it after the baby grows out of it?
How soon are you planning on having another? Is it worth it to invest in a top of the line single, when you might need a double in a year or so?
These are only some of the details that can make a difference between enjoying your stroller and cant waiting to get a different one (if you even have the budget to get another one!)
Go to the park in your neighborhood and ask the mothers if they like their stroller, and if they had to do it again which one would they get.
Small details can add a lot. When we were looking at strollers, I saw one that had a pocket to keep the raincover. Genius, here in JLM where you can go out and it looks like great weather, and a half hour later be pouring. How much shade does the awning give? You dont want to give your kid sunburn every time you take him out in the summer.
Dont get blinded by stupid details like "this one comes in burnt orange" or "Its expensive so it must be good"