These are not raw converters. What do you mean by module? If Lightroom (which I’m confused about due to where this is posted), keep in mind that if you already own Photoshop, there is really no advantage to either of these in LR since all they do is render out an image and apply their processing, just as if you had them in Photoshop.
Both of these open into a separate UI which prohibits the user from using the host program (LR or PS), until you exit. If you don't have PS then the LR version is fine, but if you have PS I like to open the raw file into PS from LR, do any levels or whatever in PS, and lastly into the NIK or OnOne UI. With the exception of Silver Efex the resulting file is.. well.. not something I'd want to keep processing in PS post NIK/OnOne.
I've reviewed OnOne in the past and am currently reviewing NIK (though I've used my own copy for a long time)
for my site.. I've uninstalled OnOne and continue to use NIK products which fit my workflow and style better. That should tell you everything.
Off-topic a bit: I'm also currently reviewing Anthropics Portrait Professional and find it a capable piece of software. But I'm having trouble finding application. Either I'm shooting models who are hand picked for their symmetry and features whom I wouldn't want to "improve", or clients who for the most part don't appreciate being "improved upon."