I like the tactical UI!
As I have a 123 and a 123-2, I programmed the first one on moon-mode and low, the second one on medium and high. So, if I take a light to use in or around the house, I just pick the one with the brightness I expect to need.
If you have to reprogram it, it'll take you about half a minute for a level. Normally, you do that only once, depending on the circumstances. Then, you have momentary light in two levels which you can access at once. With the regular UI, the light always starts in moon mode and you have to click your way. High is available at once of course, head tightened.
Think of where and how you'll use your Quark and judge with UI will be the better one! If you're unsure, take the regular one, more simple and perhaps more versatile.