TERRAPIn is a more attractive play than fIRETRAP 2c.  TERRAPIn scores two less points but leaves much less for your opponent, since they cannot put a high scoring tile on a TW square.  In addition, TERRAPIn opens two distinct TW squares: one for your opponent, and one for you.

TERRAPIn is also better than fIRETRAP c1, since it scores 8 more points.  The only benefit for c1 is that it doesn’t open an additional quadrant, but with the additional 8 points and short term defense, TERRAPIn outweighs these factors.  If need be, you can sacrifice points to close quadrants later, but this concept is less important in WWF than Scrabble.

I prefer RETRIM over TERRAPIn.  It scores 25 points less, but it keeps the valuable blank and opens far less in terms of scoring spots.  Individually these factors are less important than the points, but combined these factors outweigh the 25 points.