Choosing between those two pedals really presents a dilemma. Both offer LFO-controlled effects along with delay and reverb.
The Glass Nexus has more flexibility with the effects, while having reverb and delay available with any of those effects. The reverb and delay are rudimentary, with lots of control over the effects.
The Timeline is optimized for delay control, and has rudimentary LFO-controlled effects.
I'm leaning toward the Glass Nexus. I'll have to think on it.