"is sounder" is a correct and usable part of a sentence in written English.
It is the comparative form of the verb "sound," which means to be in good condition, to be reliable, or to be sensible. You can use "is sounder" when you want to compare something or someone to another thing or person in terms of their reliability or sensibility. For example: - John's argument is sound, but Mary's argument is sounder. - The old model of the car is reliable, but the new model is even sounder. - His financial plan is sensible, but her financial plan is sounder.
Dictionary
Exact(13)
Deseine's stance is sounder.
It is sounder, therefore, to assume independent processes in the different languages.
Their strategy is sounder, too: lend to Japanese firms and, selectively, to Asian ones with which they have good relationships.
They argue that trusting the players is sounder business than buying what their clubs can ill afford.
However, their collateral is sounder than that backing subprime CDOs, being based on company financials rather than the blandishments of mortgage brokers.The prospects for SIVs are bleaker still.
No one understands better than Ms. Warren that a financial system that treats consumers well is sounder and safer than one that mistreats and deceives them.
Similar(46)
It is sound advice.
The logic is sound.
It is sound policy.
The economy is sound.
The reasoning is sound.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com