Erro

Deu o erro : Assets\Scripts\Obstaculo.cs(35,30): error CS0019: Operator '<' cannot be applied to operands of type 'Vector3' and 'float'

Meu código do "objeto"

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Obstaculo : MonoBehaviour
{
    [SerializeField]
    private float velocidade = 0.5f;

    [SerializeField]
    private float variacaoDaPosicaoY;

    private Vector3 posicaoDoAviao;

    private Pontuacao pontuacao;

    private bool pontuei;


    private void Awake() 
    {
        this.transform.Translate(Vector3.up * Random.Range(-variacaoDaPosicaoY, variacaoDaPosicaoY));
    }

    private void Start()
    {
        this.posicaoDoAviao = GameObject.FindObjectOfType<Aviao>().transform.position;
        this.pontuacao = GameObject.FindObjectOfType<Pontuacao>();
    }

    void Update()
    {
        this.transform.Translate(Vector3.left * this.velocidade * Time.deltaTime);

        if (!this.pontuei && this.transform.position < this.posicaoDoAviao.x)
        {
            this.pontuei = true;
            this.pontuacao.AdicionarPontos();
        }
    }

    private void OnTriggerEnter2D(Collider2D outro) 
    {
        this.Destruir();
    }

    public void Destruir()
    {
        GameObject.Destroy(this.gameObject);
    }
}