Narrow down the product you're looking for. Since Godinger and Fifth Avenue Ltd. both make a wide variety of different crystal glass items, you need to have two similar items to compare. For instance, you could compare glasses to other glasses, but comparing glasses to bowls, vases or sculptures is like comparing apples to oranges.
Make two columns of facts about each product. List out the style of the glass, color, size, price and any guarantee that comes with the crystal. Compile all of the information necessary to properly compare the two items.
Decide which glass product best fits your needs. For instance, say that Godinger has a set of red crystal glasses which you feel fit your style perfectly. However, if those red glasses are outside of the budget that you can spend then they aren't a viable option. Run down a checklist of your personal needs ranging from money you can spend to color, style, tone and whether or not the glassware is insured to see which one on the list is a better fit for you.