100% agree with this. Permanent Waves and Moving Pictures being 80s albums clearly tips the balance. In my case, it's an even easier choice, as I love the synth-era, and I don't love phase one (even 2112, as mentioned above, is not among my Rush favorites). A Farewell to Kings and Hemispheres are fantastic, but that's not enough...
WildRanger apparently hasn't paid a lot of attention to how much love POW gets around here and seems to assume that, because DT is a prog metal band, the most proggy option will always win.
My rationale eight-plus months ago when this thread was as follows: the best stretch of albums is 2112 through Signals, three of which are from the 70s and three of which are from the 80s. They're basically a wash, so you have to look at the others: Rush, Fly by Night and Caress of Steel versus the three synth era albums and Presto.
Presto and Fly by Night are the best of that bunch and probably pretty comparable, so that leaves Rush and Caress of Steel against the three synth era albums. I can make one album of material worth listening to from the synth era (Distant Early Warning, The Enemy Within, Kid Gloves, Between the Wheels, Marathon, Manhattan Project, Middletown Dreams, Emotion Detector, and Mission (I previously said Time Stand Still, but Mission is the far superior song)). Rush has about a side's worth of really good to great material, and Caress is almost all good.
So...I voted for '70s by the whiskeriest of whiskers. If Permanent Waves were moved from the '80s to the '70s, then this would be the easiest choice ever.