You must think compositely when you buy layette. Many parents consider what type of stroller has to be chosen at the begining. Pushchair or pram? 2in1 set or larger? Crucial is that a wider set means cheapest elements that are inside so everything will be useful. It is not a good solution to buy a carrycot separatelly, it is an accesory that is in use only during first 6 months of baby's life. Then, you put the toddler into a pushchair.
That is why many parents select multifunctional strollers. There are sets that include frames, prams and carrycots. There is also a possibility of buying an additional car seat from a group 0/0+ and using it as a stroller too.