For me it depends on the intended task.
Hiking/Camping - Quark 2xAA and a Headlamp
EDC - SF E2DL
Nightstand - SF G2L
For a hiking/camping light, I love the functional versatility of the Quark. It's highest mode looks brighter than my E2DL (because the woods get DARK at night), and it's lowest low is excellent for survival purposes, reading, and other low light tasks. And while I've never used the strobe, SOS, or beacon functions, it's nice to know it's there in an outdoor light. I love the modes offered by Fenix and 4sevens type lights. Furthermore, while I don't doubt my E2DL would be fine with a lil dunk, the Quark is actually rated IPX8 so I'd feel a little more comfortable dunking it (esp for warranty purposes). And as far as batteries go, I run lithium AAs, so the cold resistance and long-shelf life are as good as CR123s. The Quark doesn't feel cheap either; it's light yes, but not cheap. I won't say Fenix has ever felt cheap to me, but it certainly doesn't feel as good in hand for some reason as the Quark (and definitely not as solid as the surefire). And lastly, as Carrot said, the Quarks really are cutting-edge while being affordable. ETA: Before the Quark, the Fenix L2D Q5 was my hiking light, now it's in the car emergency kit.
For the EDC light, well, I commute into a city that has been demolished by earthquakes before. I want a tough light that has a solid record of dependability with good performance. The E2DL has a good rep (as far as I've gleaned from my pre-purchase research), performs well, seems more impact resistant than fenix, and serves my EDC needs perfectly with its two simple modes (I have a iTP A3 EOS upgrade on my keychain if I need a lower low). I wouldn't mind a higher high, but it's still plenty bright for my needs. I would have a harder time scrounging for batteries if it came to it, but I do carry at least 4 extra cells. The light puts out high quality performance, and feels like it does to boot.
And as for bedside, the G2L fills that role perfectly. The light doesn't move from that spot unless I'm using it, so I don't need it to be the toughest light out there. The one mode interface is simple for a bump-in-the-night light, and it's even better with the clicky upgrade. It doesn't need the newest emitter to fulfill its duty. It's an indoor light, so water resistance is not a huge concern. It's affordable, performs well, and I have a ton of long-lasting batteries for it. If I had the spare coin, I'd get a second E2DL for the nightstand, but the G2L still does a good job.