Using Case Statement to choose select statement

I want to choose between 2 select statements whether today is the beginning of the month or not.

I am getting an error.

How can I correct the syntax for the following code?

if OBJECT_ID(N'tempdb..#RollTest') is not null
		Begin
			drop table #RollTest
		End
	Create table #RollTest(
	   [AccountNumber] varchar (15)
		,[CAmt] numeric(15,2)
		,[VisitID] varchar (15),
		Typ varchar(5)
		);
		
/*-----------------------------------------------*/
/*                                               */
/*                                               */
/*         Input PriorDay Beginning ATB          */
/*                                               */
/*                                               */
/*-----------------------------------------------*/		
	Declare @BOM as DateTime;
	Declare @CD as DateTime;
	set @BOM = 	dateadd(dd,datediff(dd,0,dateadd(dd,-(DAY(dateadd(mm,1,getdate()))-1),dateadd(mm,0,getdate()))),0)-1
	set @CD = DATEADD(dd,datediff(dd,0,getdate()),0)
	insert into #RollTest
	Case When @BOM = @CD
		
			SELECT  DAPMA.AccountNumber
			,DAPMA.CAmt
			,DAPMA.VisitID
			FROM [livedb].[dbo].[vw_DAILY_ATB_Prior_Month_ATB] DAPMA
		
	else
		
			SELECT  convert(varchar(15),DATB.AccountNumber) as AccountNumber
			  ,convert(numeric(15,2),sum(DATB.CAmt)) as CAmt
			  ,convert(varchar(15),DATB.VisitID) as VisitID
			  ,'A' as Typ
			FROM [livedb].[dbo].[tbl_DAILY_ATB_CMBAL] DATB
			where DATB.VisitID is not null and SUBSTRING(DATB.AccountNumber,1,1)<>'B' and DATB.AccountNumber not in ('A00000221516','A0000222086','A00000272018') 
			group by DATB.AccountNumber,DATB.VisitID
	end
    

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thanks

glen