Confused about transaction types

[maltese]

Consider the following transactions. How come some transactions use the entry points tokenToTezPayment and tezToTokenPayment directly whereas others invoke the use entrypoint?

Are both kinds valid and why are there different kinds?

{
  kind: 'transaction',
  source: 'tz1UCNyJTaLK6xTRfQ9QxgE16bwSJhmsJ9Nj',
  fee: '3021',
  counter: '17464483',
  gas_limit: '17093',
  storage_limit: '0',
  amount: '0',
  destination: 'KT1X1LgNkQShpF9nRLYw3Dgdy4qp38MX617z',
  parameters: {
    entrypoint: 'use',
    value: {
      prim: 'Right',
      args: [
        {
          prim: 'Left',
          args: [
            {
              prim: 'Left',
              args: [
                {
                  prim: 'Pair',
                  args: [
                    {
                      prim: 'Pair',
                      args: [
                        { int: '362047367410630693806' },
                        { int: '140296127' }
                      ]
                    },
                    { string: 'tz1UCNyJTaLK6xTRfQ9QxgE16bwSJhmsJ9Nj' }
                  ]
                }
              ]
            }
          ]
        }
      ]
    }
  }
}

{
  kind: 'transaction',
  source: 'tz1KroYSGkPbXG6mTrtQfDSUjT31vthH7vYS',
  fee: '5917',
  counter: '25501077',
  gas_limit: '12564',
  storage_limit: '0',
  amount: '1000000',
  destination: 'KT1X1LgNkQShpF9nRLYw3Dgdy4qp38MX617z',
  parameters: {
    entrypoint: 'tezToTokenPayment',
    value: {
      prim: 'Pair',
      args: [
        { int: '2552269162349198031' },
        { string: 'tz1KroYSGkPbXG6mTrtQfDSUjT31vthH7vYS' }
      ]
    }
  }
}

{
  kind: 'transaction',
  source: 'tz1gTm7dAYGBNu8QUNYa34UUpiY7NBA7vUSL',
  fee: '0',
  counter: '18649062',
  gas_limit: '15193',
  storage_limit: '0',
  amount: '0',
  destination: 'KT1X1LgNkQShpF9nRLYw3Dgdy4qp38MX617z',
  parameters: {
    entrypoint: 'tokenToTezPayment',
    value: {
      prim: 'Pair',
      args: [
        {
          prim: 'Pair',
          args: [ { int: '208132155508027287121' }, { int: '81064446' } ]
        },
        { string: 'tz1gTm7dAYGBNu8QUNYa34UUpiY7NBA7vUSL' }
      ]
    }
  }
}