VS

SELECT TOP 10 RUT_CLIENTE
, COUNT(DISTINCT IdProducto) PRODUCTOS
, COUNT(1) MOVIMIENTOS

FROM dbo.st_CL_FlujoNeto
WHERE   PERIODO > 201700
AND     DEFINICION IN('APORTE','RESCATE')
AND     LTRIM(RTRIM(MONTO_PESOS_FINAL)) != 'NULL'
AND     CAST(SUBSTRING(RUT_CLIENTE,1,LEN(RUT_CLIENTE) -1) AS INT) <= 20000000
AND     RUT_CLIENTE != 'NULL'
--AND     DEFINICION != 'NEUTRO'
GROUP BY RUT_CLIENTE
HAVING COUNT(DISTINCT IdProducto) > 2
ORDER BY COUNT(1) DESC