The phrase "a more critical factor" is correct and usable in written English.
It can be used when discussing the importance or significance of a particular element in a given context, often in comparison to others.
Example: "In this study, we found that a more critical factor in determining success was the level of community engagement."
Alternatives: "a more significant element" or "a more essential aspect".
As it turned out, rest proved to be a more critical factor than rust.
Ward will need whatever size -- and he thinks speed is a more critical factor than size -- he has added.
A more critical factor is the size of the nation's dairy herd, currently 11.2 million mature cows and growing.
A report by the traffic safety agency after the 1996 test said that "structural and component design is a more critical factor than fuel tank location".
Rather, Trump's presidency appears to be a more critical factor in informing the way people feel about the state of American democracy.
More bluntly, Visser's (2013, p. 65) characterization of wage-setting institutions as being in a "state of turmoil" augurs ill for trust, which may be a more critical factor for achieving macro stability than any particular bargaining structure.
More broadly, a platform's verification capabilities — that is, its ability to reassure both parties in a transaction by providing detailed information about with whom they are doing business and what they are getting into — is a much more critical factor in reaching a decision about a short-term rental than it is in choosing which service to use for a brief ride.
And though that number has risen, party leaders are keying on what they consider an even more critical factor: A great number of blacks consider themselves conservative.
That becomes a much more critical factor when dealing with government documents, which may be surrounded by legal restrictions on who may assign identifiers and when, and in some cases what the actual formats must be.
A far more critical factor appears to be the threshold barrier to infection and the corresponding hygiene of the individuals relative to that.
It is possible that developing male larvae require the storage of much higher amount of cholesterol than that of females and AeSCP-2 mediated cholesterol uptake from the dietary sources becomes a much more critical factor for the survival of males.
