The Biotech sector has the best prospect in the 25 to 28 day period. The estimated top ETF in that category for the mentioned period is $XBI. Next is followed by the Financial sector with a good forecast for the same period. The estimated best ETF in this sector for that period is $KBE. On the sell side, the Real Estate sector has the most underperforming outlook in the 19 to 22 day period; in this sector, $VNQ may have the worst results.