Actually my view is more of a centralized one. Take for example the genre of generic anti-FG rainbows--the sizes range from 33 or 34 cards to the maximum of 60. The 33 or 34 card rainbows struggle with quanta flow, especially since they require eternity's rewind to save them from deckout, but are highly surgical in nature ie the quinted oty comes out fast as do all the other strategic components of your standard rainbow. The 60 card ones, or even anything 44 and above for that matter, naturally have no problem with quanta generation. In fact they probably stock sundials which stall to generate quanta and draw card, and thus bank on the strategy that the longer quantum towers are in play, the more comfortable it is meeting quanta needs. As such, I personally find the balance to be at 37 cards for myself, but of course different people will have different views.
In short, while an obese deck needs drawing capability to achieve the desired strategic outlay and thus is forced to incorporate a workable stalling mechanism which is not 100% perfect, a compact one often lacks the bulk to win comfortably and might straggle resource wise especially with permanent control targetting the already scarce towers. However, it is up to each of our personal tastes to decide what balance of these two weaknesses to accept in the field of deckbuilding.