This is a great discussion and in the end, it's what's in front of you that matters. I was generic in what I said but it summed up how I feel....to a point.
I wouldn't apply that smaller is better in regards to planars for example. I started in the MMG/SMG category and quickly ascended up the ladder to the 3.5R and that is my current benchmark for all things flat, so to speak.
I believe FMV mentioned cabinet resonance and this is a killer on both sides of the monkey coffin. I've heard small bookshelves that just rapping on the cabinet is like the death knell to unhappiness....and I would venture to say that in some respects, to my own company's low end designs. Hey, you can't build a rock everytime and not everything ends up a winner.
The Spendor S5e, a hobbit sized floorstander, is damn near dead resonant and an absolute pleasure to demo or own. The last thing you would think about is cabinet resonance. Sometimes the smaller speakers just get looked over when you know there is a larger one nearby.
Blah blah...I'm rambling.
Mark
Polk Audio CS