By my name I'll bet you can guess which I will recommend. The replies that you have gotten so far are about appearance and personal tastes.
Let me tell you why wood floors increase value. First off they increase the structural strength of the house as you have 3/4 inch tongue and groove oak spanning the joists as well as the plywood.
Secondly, they make the house cleaner. Many people are recognising the health benifits from having wood floors rather than wall to wall carpet.
Thirdly, they can be restored with sanding. Carpeting has to be replaced. With inflation figured in what will replacing carpet costs 30 years from now?
Before the mad rush to wall to wall carpet in the 70's and 80's some finance companies required wood floors in all new homes they financed. They recognized the value of the investment.
Ask an unbiased Realtor which would increase the value of your home more. Don't rely on the someone selling you floor covering to make a decision.
Of course some houses are already at their maximum value for the neighborhood and this has to be factored in. The economy also is a factor. With all other factors being equal a house with a wood floor will be worth more with a wood floor than the same house without one.