The TriSquare eXRS radios operate in the 900 MHz ISM band. They do not need any type of license in the US and Canada. eXRS radios use frequency hopping spread spectrum to provide excellent privacy. With that and 10 billion channels, no one will likely ever be on your channel.
There are many different brands of two-way radio carriers. It is difficult to say which one is the best, without knowing the purpose for which the carrier is being bought. However, the best-reviewed two-way radio carriers are manufactured by Motorola. TriSquare is another well-reviewed brand.