In some regions, it may be worthwhile to install triple glazing in order to reduce heat loss and increase the temperature of the inside panes. In general, triple-glazed windows improve comfort, reduce condensation and minimize noise.
However, this is more expensive that double glazing. The return on investment may take longer to achieve, unless your energy savings are quite high. Triple glazing is also very heavy, which requires strong window profiles, specially designed to support the weight (which is the case for P.H. Tech products). If not, the lifespan of the window could be reduced.
In short, in most cases, double glazing is enough.
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