Yes this is a common norm. However, it isn't necessarily that they are more powerful, but rather the fact you can relate more to the spells that you write for your purpose, as during so one would usually have their emotions and intent clear while writing it. Things go much smoother when one feels more comfortable with the magic they are weaving.
On that note however, there are spells which are passed down from family/religion/teacher that are often cast as they are believed to hold more power and that belief allows one to cast the spell with more ease/more belief behind it. It is all up to one's own perceptions about magic, spells, tools, and other factors that can decide what is one's 'best' way to practice magic.