When discussing these radios, just like car brands and politics, everyone has their personal preferences. There are 14 channels allowed for in the FRS band. Some radios at the lower end of the price range have only one or two channels. You do not want to waste your money on these. With the increasing popularity of these, you want all 14 channels.
Some radios have a few unique codes in addition to the standard ones.
When using the codes, you have to be using the same channel and code to be able to hear another radio. The radio will stay squelched or silent even when someone is standing 50 feet away and talking. With the number of possible combinations, you can almost always find a unique combination to use even in Disney. A word of warning though. The codes cannot keep other people from hearing your conversations.