No. They're trying to position the UniFi line as their 'enterprise networking' line and the EdgeMax line as their 'carrier networking' products (a lot of their customers are running small ISPs).
Software wise, the UniFi line does seem a little more actively developed, but new EdgeRouter products are and have been coming out (like the 10Gbit EdgeRouter Infinity a little while ago, and the new EdgeRouter 4 etc.). I think a lot of the software slowness might have been that some of the devs on the EdgeMax team left (judging by the staff posting on the forums), so it's probably been taking a while for the new devs to get up to speed.
Software wise, the UniFi line does seem a little more actively developed, but new EdgeRouter products are and have been coming out (like the 10Gbit EdgeRouter Infinity a little while ago, and the new EdgeRouter 4 etc.). I think a lot of the software slowness might have been that some of the devs on the EdgeMax team left (judging by the staff posting on the forums), so it's probably been taking a while for the new devs to get up to speed.