does technical analysis work better on stocks or forex?

I have traded both stocks & forex cfds and in my opinion technical analysis is more effective when trading forex.

Technical Analysis works on all types of market. As long as there's a candlestick or Line chart to represent the price action of that instrument.

The question of which one respects technicals better, depends on personal preferences, and your proficiency in risk management and Capital Size as well. It's a skill that makes your versatile and able to adapt to any market condition and instrument.