Chargers are almost universal now (I believe there's a Chinese phone, and a few off-brand tablets, that use different plugs), so any phone or tablet charger will charge any phone or tablet. As B.Diddy said, a 2 Amp Samsung charger will charge your phone as fast as the phone will accept a charge. (Of course, if your phone won't accept more than 550mA, a larger charger won't charge it any faster.)
Wall or travel? You mean the folding plugs? Your choice. I have some of each, and really don't care which one I use if I'm looking for a charger (except for Samsung phones, which need a couple of pins shorted in the charger to charge at the full mains rate. otherwise they charge at the much slower USB rate).