i have nannies for 10 years and am lucky enough to have used loads and loads and loads of push chairs
a few i have LOVED (but more often not they annoy me or i dont like them, or i even hate them)
For me, the ease of pushing is the key factor... we live a stones throw from national park and i realised i NEED a buggy capable of pushing (well & easily) off road. (nothing more annoying than a buggy thats a nightmare to push)
I have a huge car boot, so that wasnt a factor to worry about.... it also needs to withstand going up and down 2 concrete steps every time we come into our house.. and not fall apart. (I dont trust any other pushchair to manage that regulalry for years and not brake eventually!)
I have chosen a mountain buggy urban. (but one the old ones manufactured in New Zealand (MB moved their factory to china about 2 years ago) where the quality is just fab... they are built like tanks, the easiest to push, and last for several children, STILL in perfect working order, and have life in them.
was hard to source,but i have got a brand new one from the old factory.
The car seat adapter fits ANY group 0 car seat (not just a specific one) and with the carrycot fitted baby can face me for the 1st 6 months.
Unlike most buggies which are only supposed to have children in up to 15kg (some allow 18kg) mountain buggy approve a 30kg child to sit in it... and in 10 years of nannying, myself (or parents) have not managed to break one yet!