Capture with pawn or piece??
I think it differs per situation. Creating a passed pawn can be useful and gaining tempo with your pawns can too. But disrupting your formation can be a problem. In this given situation I would definately agree with taking it with the rook. This leaves his rook locked for a few moves instead of opening up.
This is a situation I've found in one of my games recently, where black resigned at this position (not sure why...)
But, thing is, I'm not sure wheter I sould have taken the knight with my rook or with my pawn if the game had kept going...
What do you guys thinK?