We are using Maven for a large build process (> 100 modules). We have been storing our external dependencies in source control, and using that to update a local repo.
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If you need the "Pro" features of either (e.g. Staging repos, artifact promotion, NuGet), , then you need to consider the different pricing models, which are displayed on their websites.
In summary:
No matter how many users you have, Nexus Pro offers a support service that's broadly equivalent to Artifactory's $7,450/year "Silver Value Pack".
$7,450/year will buy you approximately 67 Nexus Pro seats (1-50 @ $108, the rest @ $120).
On price and support alone then, Nexus Pro makes sense until you get to 67 users, at which point Artifactory becomes the cheaper option.
If you're doing all the support in-house; however, that magic point is about 23 users (Artifactory's most basic support offering is $2,750/year).