Compare by the question you are asking
Use an equivalent scope
A useful comparison keeps dimensions, glass and installation scope aligned. If several things change at once, it is difficult to tell which choice caused the difference in price or appearance.
Bring your shortlisted options to the showroom and try the operation. The home estimate is where those choices are connected to the existing opening.
Choose the comparison that resolves your next decision
If the uncertainty is how a window moves, begin with opening-style comparisons. If it is room comfort or glazing weight, compare the glass packages and their actual ratings. If it is appearance, use the material and profile guides alongside a sample.
Installation-method comparisons answer a different question: what remains around the opening and what is replaced. Resolve that scope before drawing conclusions from price differences between product options.