I think both choices would be good. Quads may be easier to drive. And there is something to be said for not having a hybrid woofer.
I love my Martin Logan SL3s and have kept them in preference to many, many other speakers over the years but think they are difficult to match properly with electronics. Frankly most people with MLs have systems that I don't like even though I love the MLs. Many famous name amps are horrible for the MLs. They make them sound hard and screechy. I have even heard dealers who like them to sound that way. Or else they use tube amps that roll the top but can't control the bass and wimp out on the low impedance load. So I find that I am often wary of people who say they like ML because they often mean that they like MLs when driven poorly.
If you are willing to fuss with setup and find very good, high current, smooth sounding solid state electronics or very powerful and neutral tube amps to drive them, you can go to MLs. If you cheap out on the amps, you'll be making a big mistake.
I love my Martin Logan SL3s and have kept them in preference to many, many other speakers over the years but think they are difficult to match properly with electronics. Frankly most people with MLs have systems that I don't like even though I love the MLs. Many famous name amps are horrible for the MLs. They make them sound hard and screechy. I have even heard dealers who like them to sound that way. Or else they use tube amps that roll the top but can't control the bass and wimp out on the low impedance load. So I find that I am often wary of people who say they like ML because they often mean that they like MLs when driven poorly.
If you are willing to fuss with setup and find very good, high current, smooth sounding solid state electronics or very powerful and neutral tube amps to drive them, you can go to MLs. If you cheap out on the amps, you'll be making a big mistake.