MeshFilterVariants.cs

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

public class MeshFilterVariants
    : MonoBehaviour
{
    public Mesh[] Meshes;

    public void Start()
    {
        var filter = GetComponent<MeshFilter>();
        var index = Random.Range(0, Meshes.Length);

        filter.mesh = Meshes[index];
    }
}