I've been using SocialWeaver for the last few weeks and have loved what it has offer. I ran into a couple bugs, but their team was able to quickly identify and resolve the issue either the same day or next. None of the issues were show stoppers anyway, but when you receive great responsiveness from their support and they provide a quick resolution, it says a lot about the kind of customer service that I can expect from them in the future.
I have been using Yatter since July 2017 - I was one of the early adopters. I have found the training given by Richard and Colin to be excellent and the platform itself meets my needs. I have forged relationships with others that I would otherwise not have met and we comment and retweet each other's work. I also run a twitter hour. The backbone of this hour is shoutouts to certain accounts, thanks and highlighting accounts. Yatter allows me to schedule this in advance so that during the hour I can concentrate on retweeting the messages from the users, I can facilitate conversation and I can be seen. I used to be a Hootsuite fan, but since I have found Yatter, I have dumped HS. Try it out for yourself!