frs is family radio service. short transmition range of about 3ish KM. gmrs is general mobile (or media) radio service. you need a license if it's over a half watt. gmrs 1/2 watt walkies will usually have a range of 8+ KM.
use what you want but gmrs usually has better frequency security and you'll get less weak trans. static. so i'd go gmrs.
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