Start with the job to be done
Write down the outcome you need before reading marketing pages. Features that do not affect that outcome should carry less weight.
Normalize the comparison
Compare the same size, included accessories, warranty, delivery terms and expected service rather than headline price alone.
Separate evidence from claims
Specifications, recognized certifications, warranty documents and credible independent testing are stronger evidence than vague superlatives.
Keep a short decision record
A simple note of finalists, decisive differences and total expected cost makes later returns, warranty questions and repeat purchases easier.
General educational information only. Consumer rights, tax treatment, warranty obligations and return remedies vary by seller, product and jurisdiction. Use the actual contract/policy and current official consumer guidance where rights matter.