Have the Samsung s4 now, was wondering which in car charger to get or does it not matter . Only asking because where I bought the phone from advised that I only use Samsungs own
You have to watch the outputs, some of the cheapies do not have enough amps to run the phone and charge the battery, particularly if you are running e.g. satnav.
A lot of cars are getting USB sockets as part of the radio, even my pickup has a USB socket (but it's in the glove box so I have on for the lighter thing too).