It's ETF Battles time, and in today's episode we'll be comparing the two biotech giants iShares Biotechnology ETF (IBB) Vs. SPDR S&P ETF (XBI).

Back on April 9, I talked about a “Great Rotation” away from momentum plays (e.g., biotech, Internet, small-cap growth, etc.). Where did the smart money go?

Nobody can tell you when a 10% stock market pullback is imminent. That has not stopped many from issuing erroneous prognostications over the last 31 months. By the same token, no individual can predict when a correction will morph into a 20% bearish sell-off.

Picking from the multitude of sector ETFs is a daunting task. In any given sector there may be as many as 45 different ETFs, and there are at least 181 ETFs across all sectors.

The Health Care sector ranks seventh out of the ten sectors as detailed in my Sector Rankings for ETFs and Mutual Funds report. It gets my Dangerous rating, which is based on aggregation of ratings of 22 ETFs and 82 mutual funds in the Health Care sector as of April 4, 2014.

Top scoring weekly returns for the week of March 30, 2014: Buy and Hold 1 Year