The phrase "a more important aspect" is correct and usable in written English.
You can use it when discussing the significance or relevance of a particular element in a broader context.
Example: "While there are many factors to consider, a more important aspect of the project is its impact on the community."
Alternatives: "a crucial element" or "a key factor".
Perhaps a more important aspect of Dr. Lee's legacy, colleagues said, is the respect for scientific evidence and objective investigation that he has brought to Connecticut.
A more important aspect, surely, is that there are three teams among the last eight for whom performance is as important as either the result or the money.
(This question is likely to be raised with considerable force if the nationalistic backlash in Asia, which is clearly present although so far still surprisingly muted, becomes a more important aspect of the situation.
In your book, you explain your research began with natural climate variability and you said you believed this was a more important aspect to climate change than many scientists thought.
A more important aspect to consider is whether or not these tests provide estimates of bioaccessibility that are useful for refining bioavailability and Pb exposure assessments.
There's a plot line here that drives the action more so than the main story in say, Skyrim, which is very similar in other regards, but side quests are still a key ingredient, and a more important aspect of the overall play experience than they have been in any other previous BioWare title, which is why it's a good thing that they're varied, rich and interesting in their construction.
A far more important aspect than anything that occurs on the pitch.
This shift is indeed a far more important aspect of Leo Strauss's influence than the occasional resort to Platonic "noble lies".
"Certainty is a much more important aspect than severity," Mr. Simon said, arguing for more oversight and run-of-the-mill prosecutions, rather than the occasional high-profile trial.
"It might appear as if these laws are turning back demographic tide in Arizona, but economic forces are a much more important aspect of that development recently".
Men also have a perceived cachet as fund-raisers, an ever more important aspect of the job in the United States and one tied to the male-dominated business world.
