This is personal preference, but also based on experience. I would buy a sling over that system any day. I think a stroller is quite useful, especially if you are planning more than one child, but mine was rarely used for a baby. It was much easier to wear to move around a shopping centre etc while wearing a baby, than pushing a pram. Especially near Christmas LOL! Sure you still have to transfer to/from car and sling, but a young baby will usually sleep through that, and for some time after that they usually go back to sleep easily.

Not to mention that it's so much nicer having baby close, and it is also means they settle more easily. Studies have shown that babies that are worn cry a lot less than those that are not!