feed on demand
new borns should not go 4 hours between feeds , they are too little, and need feeding far more frequently
they have tiny stomachs that need filling little and often
aiming for 3 - 4 hours between feeds is going to get you and baby very upset
also, formula fed babies have growth spurts too and there will be periods of time where they feed non stop
formula fed babies might go a bit longer between feeds , but not from birth and not for hours longer
the formula to go for is the one you can buy from the all night garage/corner shop etc. when you get to the 2 am feed and you have run out ( it happens!_) and perhaps one that comes in liquid form too....for convenience sake, formula is pretty much all the same
as for bottles, i always used bog standard avent/ tommee tippee, cheap and cheerful , changing the teats as the babies got older