jetpack compose - Box vs Surface

MainActivity.kt

package com.cfsuman.jetpackcompose

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import androidx.activity.compose.setContent
import androidx.compose.foundation.BorderStroke
import androidx.compose.foundation.background
import androidx.compose.foundation.layout.*
import androidx.compose.material.*
import androidx.compose.runtime.*
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.ui.unit.dp

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        setContent {
            GetScaffold()
        }
    }


    @Composable
    fun GetScaffold(){
        Scaffold(
            topBar = {TopAppBar(
                title = {Text(
                    "Compose - Box vs Surface",
                    color = Color.White)},
                backgroundColor = Color(0xFF333399)) },
            content = { Box(Modifier.fillMaxSize()
                .background(Color(0XFFEDEAE0))){MainContent()}}
        )
    }


    @Composable
    fun MainContent(){
        Column(
            Modifier.padding(32.dp),
            verticalArrangement = Arrangement.spacedBy(16.dp),
            horizontalAlignment = Alignment.CenterHorizontally
        ){
            Box(
                Modifier
                    .fillMaxWidth().height(150.dp)
                    .background( color = Color(0xFF87A96B) ),
                contentAlignment = Alignment.Center,
            ){ Text("Box") }

            Surface(
                Modifier.fillMaxWidth().height(150.dp),
                color = Color(0xFF87A96B),
                border = BorderStroke(2.dp,Color.Red),
                elevation = 4.dp
            ) {
                Text("Surface")
            }
        }
    }


    @Preview
    @Composable
    fun ComposablePreview(){
        //GetScaffold()
    }
}