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They are simply different MHz of frequency wave. You should choose according to your environment. VHF works best out-of-doors or line-of-sight, especially around rocks, hills, dirt and trees. UHF has a better ability to work in and around buildings, metal, concrete, and brick. Either will work short distances radio-to-radio and line-of-sight. You will just get better range when using VHF or UHF in the environments described.
Your radios will need to be programmed by a Motorola dealer to match one another. (Usually $15-$25.) The software used to program the radios is a Motorola proprietary software and not for sale, but most dealers have a subscription to it.
The loud buzzing indicates the channel you are on is not programmed.