Help us 'help you'. A clearer idea of your topics premise may cut down on useless data.
For your stats - are you concentrating on quality available now
or quality from years ago? Or is it simply X amount of people prefer brand A compared to brand B?
Does your overall thesis/Topic have a subjective outcome? ie Quality overall has declined regardless of brand choice, or are you simply after raw 'consumer' data?
For stat fluff sake - I had a pre-built Hewlett Packard
which lasted Seven+ years until I intentionally 'terminated it'
The family had a Packard Bell that that was a PITA flawed unit from day one for 5+ years. The 15"inch LCD screen still works though
More recent, My sister has a Compaq
Presario Laptop that made it ~2years before requiring repairs.
My father had an ASUS eepc that still works, although the build quality is sub-par.
Sheep consumer choice:
Recognised Brand reputability. Configurable options. Range. Price. After sales 'support'
Apple. Same as a above.