FXIS Market Insights

In terms of scale settings for technical charts, many charting packages allow you to set the scale to either arithmetic or log/semi-log charts.  The differences in terms of drawing trend-lines can be significant, potentially giving wrong entry/exit point signals for major trends.
A good example is illustrated below:
S&P 500 weekly chart analysis by Serge Perreault courtesy of http://www.dshort.com/

Alternatively, a basic trend-line drawn on a different charting package eSignal, using a standard scale.

Which one of the two settings is used by the majority of traders?
You can cast your vote here:  http://polls.linkedin.com/p/77694/bzfqm