I’ve always preferred Unity desktop’s HUD and Lens over GNOME’s Activities. In all likelihood I’ll keep both desktop environments installed after Bionic Beaver is released later this week.
GNOME has a better workflow but I never liked the amount of vertical space wasted between the top bar and window below.
Unity’s Lens are largely useless, so perhaps I’ll drop both for a more traditional approach.
Lubuntu minimal with i3wm had been my primary desktop since December so its the strongest contender.
I may hop to other flavors like Budgie, XFCE or MATE.
Peppermint is another option although it won’t be based on 18.04 for a few months.