The benefit of using expired domains for pbn is that they already have pre existing authority, ranking and traffic. This means that when they are linked to your money site they will pass their SEO power on. This is much quicker than starting from scratch with new domains that have to build themselves up. Obviously you want to use a high quality expired domain as you will be linking it to your money site. This means that it needs to be relevant to your niche and have quality content.
Using tools like expired domains for pbn can help you find expired domains with great metrics such as Page Rank, Domain Authority and Trust Flow. These metrics will help you judge how well a domain might perform in search engines. You should also check whether a domain has ever been penalized by Google, as this can be a big problem when you are building a PBN.
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Another important factor to consider is what kind of industry the domain was previously ranked in. It is best to get a domain that is related to your industry so that it can pass its links juice to your money site. For example, adding a domain that was previously ranked in the auto parts industry to your gaming-related PBN will not be beneficial for you.
You also want to make sure that the expired domains you are considering have backlinks from a variety of sources. If too many of the links are from the same source, this will be flagged by Google as unnatural and you may end up getting a penalty. Therefore, you should look for a mix of different sites with high metrics as this will be more effective.