Lightning Picklist/Select : Aura vs LWC

Lightning Picklist/Select : Aura Component

PickListOptionsController(Apex Controller )

public class PickListOptionsController {
    @AuraEnabled        
    public static List getPickListOptionList(String objectName, String picklistFieldName){
        List picklistOptionList = new List();
        Schema.SObjectType convertToObj = Schema.getGlobalDescribe().get(objectName);
        Schema.DescribeSObjectResult res = convertToObj.getDescribe();
        Schema.DescribeFieldResult fieldResult = res.fields.getMap().get(picklistFieldName).getDescribe();
        List ple = fieldResult.getPicklistValues();
        for( Schema.PicklistEntry pickListVal : ple){
            picklistOptionList.add(pickListVal.getLabel());
        }     
        return picklistOptionList;
    }
}

PickListOptionsComponent.cmp (Component)

<aura:component controller="PickListOptionsController" access="global" >
 <aura:attribute name="objectName" type="String" default="Opportunity" />
 <aura:attribute name="picklistFieldName" type="String" default="StageName" />
 <aura:attribute name="picklistValues" type="List" />
        <aura:attribute name="opp" type="Opportunity" />
        <aura:handler name="init" value="{!this}" action="{!c.doInit}" />
        <lightning:layout>
        <lightning:layoutItem flexibility="auto" padding="around-small">
            <div class="custom-box">
                <lightning:select value="{!v.opp.StageName}">       
                     <option value="">Choose one...</option>
                   <aura:iteration items="{!v.picklistValues}" var="item">
                     <option value="{!item.value}">
                          {!item}
                     </option>
                   </aura:iteration>
                </lightning:select>
           </div>
       </lightning:layoutItem> 
       </lightning:layout>
</aura:component>

PickListOptionsComponent.js (JS Controller )

({
    doInit : function(component) {
        var action = component.get("c.getPickListOptionList");
        action.setParams({
            objectName: component.get("v.objectName"),
            picklistFieldName: component.get("v.picklistFieldName")
        });
        action.setCallback(this, function(response) {
            var list = response.getReturnValue();
            component.set("v.picklistValues", list);
        })
        $A.enqueueAction(action);
    }
})

Lightning Picklist/Select : Lightning Web Component

LightningPicklist.html (Template)

<template>
<div class="slds-box slds-p-around_none slds-m-top_x-small slds-m-bottom_medium slds-m-horizontal_none">
<lightning-layout multiple-rows>
<lightning-card icon-name="standard:record" title="{strTitle}">            
        <lightning-layout-item size="12" medium-device-size="6" large-device-size="6" small-device-size="12" padding="around-small">
                <div>
                    <template if:true={stageNamePicklist}>
                        <lightning-combobox name="stageName"
                            label="Opportunity Stage Name"
                            value={stageName} options={stageNamePicklist} onchange={handleStageNameChange}>
                        </lightning-combobox>
                    </template>
                </div>
          </lightning-layout-item>
</lightning-card>
</lightning-layout>  
</div>
</template>

LightningPicklist.Js (JS Controller )

import { LightningElement,wire,api,track } from 'lwc';
import { getPicklistValues } from 'lightning/uiObjectInfoApi';
import { getObjectInfo } from 'lightning/uiObjectInfoApi';
import OPPORTUNTITY_OBJECT from '@salesforce/schema/Opportunity';
import STAGE_NAME_FIELD from '@salesforce/schema/Opportunity.StageName';
export default class LocalMattersGroupDetails extends LightningElement {
    @track stageNamePicklist='';
    strTitle=''
    stageName='OPPORTUNTITY STAGE';
    //Get Object Information
    @wire(getObjectInfo, { objectApiName: OPPORTUNTITY_OBJECT})
    objectInfo;

    // 'Group' is recordType name on OPPORTUNTITY_OBJECT
    //Get RecordTypeId
    get recordTypeId() {
        const rtis = this.objectInfo.data.recordTypeInfos;
        return Object.keys(rtis).find(rti => rtis[rti].name === 'Group');
    }
    //Get PickList Information : OPPORTUNTITY_STAGE
    @wire(getPicklistValues, { recordTypeId: '$objectInfo.data.defaultRecordTypeId', fieldApiName: STAGE_NAME_FIELD})
    stageNamePicklist;
    handleStageNameChange(event) {
        this.stageName= event.target.value;
        // eslint-disable-next-line no-console
        console.log("Stage Name :", this.stageName);
    }
}

LightningPicklist.js-meta.xml (XML for Config File in Salesforce)

<lightningcomponentbundle fqn="LightningDataTable" xmlns="http://soap.sforce.com/2006/04/metadata">
    <apiversion>45.0</apiversion>
    <isexposed>true</isexposed>  
    <targets>  
        <target>lightning__RecordPage</target>  
    </targets>  
</lightningcomponentbundle>

Note: After save whole code you will drag and drop code into Lightning Record Detail Page of Opportunity

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