Fixed take-profit vs trailing stop
A fixed take-profit closes the trade at a predetermined price. A trailing stop keeps the trade open as long as the trend continues. Neither is universally superior — the choice depends on the strategy.
Trend-following strategies often use trailing stops to capture extended moves. Mean-reversion and breakout strategies more commonly use fixed take-profits tied to a measured move target.
The RR connection
Take-profit placement is half of the risk/reward ratio calculation. Moving the take-profit after entry is a post-hoc rationalisation, not strategy. The honest RR is fixed at entry.