The color of the alloy that is chosen for your all-metal dental crown may be the only one of its characteristics that is much of a concern to you. Metals are usually considered to be either yellow (like gold) or white (silver colored). The color of an alloy is determined by its composition.
Noble alloys will cost more than their less noble counterparts and this may be a consideration in your case. Also, be aware of the fact that your dental insurance policy may specifically state which types of alloys may be used. Or may provide coverage at a different rate for different classes of metals.
It has been reported that about 10% of women and 5% of men have an allergic response to nickel, chrome and/or beryllium alloys. For this reason a noble alloy might be a much better choice than a base metal one.
Your dentist's concerns about which alloy is chosen for your dental crown will run more along the lines as to which type of alloy will be easiest for them to work with. It is commonplace that a dentist will have a strong opinion, typically based on past experiences, about the specific types of alloys they will consider working with.
Dentists typically prefer to use alloys that have a high noble metal content. The dental crown fabrication process (casting) usually results in a more accurate crown fit when noble metals are used. The closer the fit, the less adjustment they will have to perform when placing the crown. Some alloys have characteristics that make fit adjustments more possible than with other alloys. If the dentist feels that they will need or want these characteristics, it will influence their choice of an alloy.
For the reasons just given, the best choice is usually the alloy that has the highest noble content if, from a financial standpoint, it is possible for you. Noble alloys come in both yellow and white colors, so you are still likely to have a choice in that regard.
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