The phrase "a much better impact" is correct and usable in written English.
It can be used when comparing the effectiveness or influence of one thing over another, indicating a significant improvement.
Example: "The new marketing strategy has had a much better impact on our sales compared to last year's approach."
Alternatives: "a significantly greater effect" or "a far more positive influence."
There were a number of things that he could have articulated for a much better impact to his points.
The research suggests that having a small, intimate group of best friends during high school has a much better impact on mental health during adulthood than being super popular does.
You need to understand that controlling another person won't make your situation better and that finding another way to actually fix the problem will have a much better impact on your life.
I read the story in the Times that came out a couple years ago, but you get a much better sense of the impact on people's lives when you hear the descendants of slaves talk about it".
"Because you have such a small geographic area you get a much better microeconomic picture of the impact that arts organizations have on their neighborhoods.
For the general public to realise the benefit of nursing expertise they require a much better general understanding of the impact that nurses have on outcomes and quality of life, and the multiplicity of roles that nurses can play in their lives.
"If [government agencies] had the kind of data that we tell them they should obtain, we'd be in a much better position to judge the impacts on the sea turtles in the Gulf of Mexico and the repercussions down the line," says Bjorndal.
In particular, by contrasting to MF-MTD, AMPC, and MAMPC can attain to a much better estimation and significantly alleviate the impact of clutter.
He has a much better chance of making an immediate impact at the North West than at the Isle of Man TT as it's possible to learn the circuit very quickly on your first appearance.
Business intelligence solutions with straight-forward incorporation requirements and immediate impact, is a much better alternative for small companies.
"It's probably going to have a greater impact because Texas has a much better team.
