Ad Metrix is well suited for teams that are directly tied to sales teams as well as teams that use DMP and other platforms to help target and retarget specific users for ads or site visits/views.
It may not be as useful if the organization is not targeting specific users or isn't interested in their consumption habits and what competitors are focusing on.
RainKing is less appropriate when you don't have the funds or resources to pay for it. You could easily Google the information that you're looking for, or use CrunchBase, but it's extremely time-consuming. RainKing makes this very easy and the data seamlessly sends to Salesforce with the proper integration. RainKing is very appropriate when you have a large team of folks that need to source leads/accounts simultaneously and need licenses to do so - it's worth the money with a larger team.
Site Analytics data - ComScore puts all of the stats you need in an easy to read dashboard. I don't need to search around like I do in Google Analytics to find out who is visiting my client's site, where they are browsing, how long they are engaging with the content. It's also really easy to integrate conversion data alongside website analytics. The webpage heat maps are also an awesome way to look at where people are engaging with the client's webpages.
Infographics, charts - I love how easy it is to pull a client ready chart that I can insert into a presentation for the client to show various stats pertaining to their campaigns (e.g. most visited pages, most viewed videos, MoM stats on orders/revenue/average order value.
Report Builder - Makes it simple to pull reports on site analytics that I can easily add filters to. I can get all the data I need in one report. I do a lot of presentation building for the clients on a monthly basis. This makes it more efficient for me to pull out sharable insights.
Being able to search for companies that are currently evaluating solutions in your space.
The contact information for people and related people is also great, I have used dozens of other data solutions and prefer Rainking.
Rainking also gives you the ability to create lists of your ideal buyer and download them which was great for my team and I pull new contacts to prospect!
I can't get over how impressive the org chart info is in RainKing, it allowed myself and my team to find other involved prospects and get a good feel for organizations.
The staff is available pretty quickly for questions, but are not really around in-person to meet with me and my team. They are able to solve my problems online and do work sessions as needed via skype.
They're both fairly similar in relaying data for us on our viewers. We've used comScore longer and are able to compare specific data to one another as well as competitor sites
I've used SalesNavigator and Zoom Info. I actually think that Ranking is a great solution if you can use it in tandem with SalesNavigator. When it comes to pulling lists, in my opinion, Ranking does it best. Now that it has the database combined with Discoverorg, it's even more powerful to use.
I have not used the tool long enough to determine myself, but my understanding is the team has been able to drive growth and sales significantly through the use of the tool.
I don't have that information readily available to quantify the positive impact. However, I will say that I've found a lot of good prospects via RainKing to target my outreach efforts to. I definitely feel like the product pays for itself.