If a colleague needed a platform with fast customer service and detailed reporting to sell their mobile inventory then I would recommend Rubicon Project. However, if my colleague needed a platform that gave instant current reporting data then I would be less likely to recommend Rubicon Project to them.
Smaato is very well suited for user acquisition and retargeting companies. Their overlap in terms of audiences and publishers with other exchanges is very limited, which makes it a great alternative when you need to scale a campaign and want to maintain your frequency cap. They work very well in branding campaigns as well as performance campaigns.
Cleanest supply ecosystem. They are skilled at processing inventory and bids in order to streamline monetization and drive yield.
Client support is excellent. Client services is deeply invested in your business and successful at driving key business goals within your organization when working on your behalf.
Smaato has a UI where you can control your line items on the traffic you want to receive. That is a key unique selling point that other SSPs don't offer. Most of the items that you will need like reporting can be done on a self serve manner and that is a big plus, specifically for changes that need to happen really fast and you don't need to deal with account managers that may take some time to answer emails.
Smaato's account management team is very professional. They are quite fast in terms of customer support, which is very helpful. One item that stands out is that they are willing to understand what you need for each campaign and what is the best way to move forward. They don't just jump quickly into trying to upsell more of Smaato's products (audiences, data) like other SSPs do.
Rubicon Project has made it easier to optimize so that we could get the fullest ROI on our inventory through their alerts on which deal needs troubleshooting.
They also send a daily report which notifies you which advertisers have low render rate which is very helpful when figuring which creatives need to troubleshooting.