Best Query Approach

I have a scenario to display data from 2 tables combined. First table Named 'DayTable' consists of daily plan and actual. Second table named 'MonthTable' consists of Monthly plan and actual. I need to display last 6months data and the current month daily data.

My output is like

For this i wrote the query in 2 methods. One is using temp tables and another with out temp table. Please suggest the best apporach for this. Details are below

Approach 1: Using Temp Table

Declare @startdate date = CONVERT(DATE, DATEADD(dd, -DAY(DATEADD(MONTH, 0, GETDATE())) + 1, DATEADD(MONTH, 0, GETDATE()))) 
     Declare @endDate date = DATEADD(DAY, -DAY(DATEADD(MONTH, 1, GETDATE())), DATEADD(MONTH, 1, GETDATE()))
    CREATE TABLE #TEMP
    (
     PlanDate NVARCHAR(100),
     [PastTrend - Plan] INT,
     [PastTrend - Actual] INT,
     [Current - Plan] INT,
     [Current - Actual] INT,
    )
    ;With cte
    as
    (
    	Select @startdate sDate
    	Union All
    	Select DATEADD(day,1,sDate) From cte where DATEADD(day,1,sDate) <= @endDate
    )
    INSERT INTO #TEMP
    SELECT 
    REPLACE(CONVERT(CHAR(6), A.sDate, 106),' ',' - ') PlanDate 
    ,NULL AS [PastTrend - Plan]
    ,NULL AS [PastTrend - Actual]
    ,SUM(B.PlanQuantity) AS [Current - Plan]
    ,SUM(B.Actual) AS [Current - Actual]
    FROM cte A 
    LEFT OUTER JOIN DayTable B 
    ON A.sDate = CONVERT(DATE,B.PlanDate) 
    GROUP BY A.sDate 
    SELECT
    *
    FROM
    (
    SELECT 
    CONVERT(CHAR(3), datename(month,PlanMonth)) + ' ' + RIGHT(CONVERT(VARCHAR(4), YEAR(PlanMonth)), 2)  AS PlanDate
    ,SUM(PlanQuantity) AS [PastTrend - Plan]
    ,SUM(Actual) AS [PastTrend - Actual]
    ,NULL AS [Current - Plan]
    ,NULL AS [Current - Actual]
    FROM 
    MonthTable 
    WHERE CONVERT(DATE, PlanMonth) >= CONVERT(DATE, DATEADD(dd, -DAY(DATEADD(MONTH, 0, GETDATE())) + 1, DATEADD(MONTH, -6, GETDATE())))
    group by PlanMonth   
    UNION ALL

    SELECT 
    PlanDate
    ,[PastTrend - Plan]
    ,[PastTrend - Actual]
    ,[Current - Plan]
    ,[Current - Actual]
    FROM 
    #TEMP
    ) T1
     DROP TABLE #TEMP

When i use Actual execution plan, Query Cost (relative to the batch) : 90%

Approach 2: With out temp Table

Declare @startdate date = CONVERT(DATE, DATEADD(dd, -DAY(DATEADD(MONTH, 0, GETDATE())) + 1, DATEADD(MONTH, 0, GETDATE()))) 
         Declare @endDate date = DATEADD(DAY, -DAY(DATEADD(MONTH, 1, GETDATE())), DATEADD(MONTH, 1, GETDATE()))
    ;With cte
        as
        (
        	Select @startdate sDate
        	Union All
        	Select DATEADD(day,1,sDate) From cte where DATEADD(day,1,sDate) <= @endDate
        )
        SELECT
        T1.PlanDate
        ,T1.[PastTrend - Plan]
        ,T1.[PastTrend - Actual]
        ,T1.[Current - Plan]
        ,T1.[Current - Actual]
        FROM
        (
        SELECT 
        A.sDate AS OriginalDate
        ,REPLACE(CONVERT(CHAR(6), A.sDate, 106),' ',' - ') PlanDate 
        ,NULL AS [PastTrend - Plan]
        ,NULL AS [PastTrend - Actual]
        ,SUM(B.PlanQuantity) AS [Current - Plan]
        ,SUM(B.Actual) AS [Current - Actual]
        FROM cte A 
        LEFT OUTER JOIN DayTable B 
        ON A.sDate = CONVERT(DATE,B.PlanDate) 
        GROUP BY A.sDate 
        UNION ALL
        SELECT 
        PlanMonth AS OriginalDate
        ,CONVERT(CHAR(3), datename(month,PlanMonth)) + ' ' + RIGHT(CONVERT(VARCHAR(4), YEAR(PlanMonth)), 2)  AS PlanDate
        ,SUM(PlanQuantity) AS [PastTrend - Plan]
        ,SUM(Actual) AS [PastTrend - Actual]
        ,NULL AS [Current - Plan]
        ,NULL AS [Current - Actual]
        FROM 
        MonthTable 
        WHERE CONVERT(DATE, PlanMonth) >= CONVERT(DATE, DATEADD(dd, -DAY(DATEADD(MONTH, 0, GETDATE())) + 1, DATEADD(MONTH, -6, GETDATE())))
        group by PlanMonth 
        ) T1 
        ORDER BY T1.OriginalDate

So can you suggest the best one. Actually i wrote the second method to avoid temp tables. If any failed in the query after create temp table, it will deleted. To avoid like problems and for simplicty i prefer the second. one. But now i am confused which is the best one in the performance wise also.