<p>I'm new to 3D printing, but my printer supports Linear Advance. I heard that it offers improvements in print quality. I used <a href="https://marlinfw.org/tools/lin_advance/k-factor.html" rel="nofollow noreferrer">Marlin Linear Advance Pattern Generator</a> to generate a print with horizontal lines at a variety of k-values.</p>
<p>Which K-Value would be best from my below image?</p>
<p><a href="https://i.stack.imgur.com/i8UAF.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/i8UAF.jpg" alt="enter image description here" /></a></p>

As a general answer to evaluate the effectiveness of the K-factor, when the K-factor Calibration Pattern generator output print is inconclusive (probably not in this case), printing a tower at various K-factor values might give you more insight, e.g. like:
To vary the K-factor with height, a similar procedure as in
How does one use a heat tower?
can be followed to insert a new K-factor with
G-code
```
M900
```
.