I'm about to buy a Plex. I hadn't really considered the Trace Elliott.
I'm a long time GK fan, so I think I'm more comfortable with the GK sound and electronics. I've owned a GK mini MB150 1x12 combo amp as well as an 800RB for my big rig that I sold long ago and wish I hadn't.
I just looked at the Trace Elliott and -- I'll just be blunt -- I like the look of the Plex more. The Trace Elliott wouldn't make me happy on a pedal board or a stomp box or on my floor. So I doubt I'll test it out.