If you are expecting to close and live in the residence then you should select the view and floor height that will appreciate most over time as well as one that you will enjoy living in. The higher floor with unobstructed views are the best.
If, however, you plan to lease the condo to a tenant, you will want one that appeals to the greatest number of potential tenants. This can also depend on the area your purchase is located. If you are in an urban environment, a one bedroom for single tenants may be best; in a resort area, a condo-hotel unit with a management program may work for you. In a suburban neighborhood, two bedrooms are often better because they attract couples without children, single parents with a child or singles with a roommate.
If you plan to sell your condo purchase for a profit as quickly as possible then the least expensive unit on the lowest floor (typically studios and one bedrooms) have shown the highest percentage of return based on previous condominium resales.