I think it depends on the player and the opponent you're playing. For me personally, when I feel a lot of pressure and get tight, my forehand is the first thing that breaks down. In these cases, I go to the net more often and win many more points at the net than staying back and hitting from the baseline.
At the net, it's all just refexes and feel (which are my strengths) vs. if I stay at the baseline, I have to deal with my weakness which is tightness under pressure and thinking too much.
Also if you play pushers who dont hit with a whole lot of pace, and generally dont have great passing shots, it's great coming to the net. In fact, I've recently discovered that this is my strategy for beating them. If I stay at the baseline with these guys, they'll just push and moon-ball until I make a mistake.