Which of the two methods is better for performance using temp tables?

Hello Everyone,

In case of temp tabes, is it better to go for minimal number of temp tables with joins or go with many temp tabes. As a geneal rule, which is better, to split up tables or
use a single table with many joins.

For example consider the below code
i create 4 temp tables.



CREATE TABLE #ModifiedOrderKeyId(OrderKeyId INT)
CREATE TABLE #ModifiedRtid(Rtid INT)
CREATE TABLE #ModifiedOrderDetailId(OrderKeyId INT)
CREATE TABLE #ModifiedOrderFormId(OrderKeyId INT)

    INSERT INTO #ModifiedOrderDetailId
    select distinct OD.orderkeyid
    from TBLORDERDETAIL OD(NOLOCK)
    where OD.MODIFIEDDATETIME >@LastModifiedDate----@LastModifiedDate

    INSERT INTO #ModifiedOrderFormId
    select distinct OFV.orderkeyid
    from TBLORDERFORMACTIVITYVALUE OFV(NOLOCK)
    where OFV.MODIFIEDTIME >@LastModifiedDate--'2014-10-25 18:23:45.590'--


    INSERT INTO #ModifiedOrderKeyId
    select orderkeyid
    from #ModifiedOrderDetailId md
    union
    select  orderkeyid
    from #ModifiedOrderFormId md
    where not exists (select 1 from #ModifiedOrderDetailId mf where md.OrderKeyId=mf.OrderKeyId)

    INSERT into #ModifiedRtid
    select DISTINCT SS.RTID
    from #ModifiedOrderKeyId MK
    INNER JOIN TBLORDERDETAIL OD(NOLOCK) ON MK.OrderKeyId=OD.ORDERKEYID
    INNER JOIN TBLSTOPSUMMARY SS(NOLOCK) ON OD.STOPID=SS.STOPID

after modification by using only a single temp table


    INSERT into #ModifiedRtid
    (select OD.orderkeyid
    from TBLORDERDETAIL OD(NOLOCK)
    where OD.MODIFIEDDATETIME >@LastModifiedDate
        union
    select OFV.orderkeyid
    from TBLORDERFORMACTIVITYVALUE OFV(NOLOCK)
    where OFV.MODIFIEDTIME >@LastModifiedDate) a
    INNER JOIN TBLORDERDETAIL OD(NOLOCK) ON MK.OrderKeyId=OD.ORDERKEYID
    INNER JOIN TBLSTOPSUMMARY SS(NOLOCK) ON OD.STOPID=SS.STOPID

Which is better the first one usng  4 temp tables or the second methd usiing a single temp table and what are the advantages/disadvantage of both the methids.

Regards

Regards