I recommend DTR radios if you can afford the cost as many places there is way too much FRS/GMRS traffic. Some crowded amusement parks, cruise ships, and other public places have too many other people using the same channels.
This is where DTR shines, nobody will hear your conversations and you will not hear their's either. You hear what you want to hear on your own private channel.
The cost is the real hit though, as your basic DTR410 is about $250. But for the fact that you do not hear every little kid keying up saying "Hello"? Or the 30-40 something hitting the call button every few seconds, this is worth the price.