What is -vbparams argument and what its the difference with -testactivationheight on Bitcoin functional tests?

Taproot test use the argument -vbparams , but other test like SegwWit use –testactivationheight, what is the use of each one and the difference for using one or the other?

class WalletTaprootTest(BitcoinTestFramework):
    """Test generation and spending of P2TR address outputs."""

    def set_test_params(self):
        self.num_nodes = 3
        self.setup_clean_chain = True
        self.extra_args = [['-keypool=100'], ['-keypool=100'], ["-vbparams=taproot:1:1"]]
        self.supports_cli = False
class SegWitTest(BitcoinTestFramework):
    def set_test_params(self):
        self.setup_clean_chain = True
        self.num_nodes = 3
        # This test tests SegWit both pre and post-activation, so use the normal BIP9 activation.
        self.extra_args = [
            [
                "-acceptnonstdtxn=1",
                "-rpcserialversion=0",
                "-testactivationheight=segwit@432",
                "-addresstype=legacy",
            ],