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Thanks for the reply. It was only an example with the laptop as product

My question is about if any of you have seen a trend in the search results that google rank front pages higher than landing page? I have been ranking #1 for a competitive search term with a landing page like
company.com/keyword
But now I have dropped several positions and the competitors that now outrank me have the front page as landing page. It doesn't seem that the competitors have done anything SEO-wise that should outrank me.

My product is laptop and of cause, I like to rank high for the keyword "laptop". Do any of you know if the search engines tends to rank a front page higher than a landing page?

Eg. www.brand.com vs. www.brand.com/laptop

I have a wiki (wiki 1) where many of the pages are well index in google. Because of a product change I had to create a new wiki (wiki 2) for the new version of my product.

Now that most of my customers are using the new version of my product I like to redirect the user from wiki 1 to wiki 2. An example of a redirect could be from wiki1.website.com/how_to_build_kitchen to wiki2.website.com/how_to_build_kitchen.

Because of a technical issue the url I redirect to, needs to have a parameter like "?" so the example will be wiki2.website.com/how_to_build_kitchen?

Will the search engines see it as I have two pages with same content?
wiki2.website.com/how_to_build_kitchen
and
wiki2.website.com/how_to_build_kitchen?

And will the SEO juice from wiki1.website.com/how_to_build_kitchen be transfered to wiki2.website.com/how_to_build_kitchen?