If I could have just one do it all flashlight I'd pick the Arc XXX P, especially since you indicate it's bright enough for you for night hiking. There's more advanced flashlights out there with multiple settings, a brighter LED, etc but the Arc XXX P just has a certain Zen like simplicity and robust functionality. On and off, that's all you need. Sure, some other flashlights have multiple power settings, but the Arc seems to have a brightness that hits the sweet spot for me. Not too bright, not to dim. But what I really like about this light is the beam pattern, it's kind of like in between a flood and a spot light. It's really great for around camp and good for hiking too. I find that most of the other lights I have tried have more of a spot beam which is good for hiking but I don't like that pattern for camp chores or reading.
I've got an Arc XXX P premium from a couple of years ago (probably the same as the one you have) plus I just bought another one. Arc recently updated the LED on the Arc XXX P and it's a little brighter.
I've bought a few other AAA and AA state of the art flashlights like the Fenix LOD-CE, (AAA battery), Fenix POD-CE (CR123) battery, plus I have a Jetbeam that runs off a AA battery. These latter flashlights are very impressive, they have the latest CREE LED (the Arc XXX does not), multiple power settings, etc but I don't like the spot beam that most of these flashlights seem to have. I find them less useful for camp chores than a flood beam, but that's my personal preference. Also, the clips on the fenix lights I've bought are rather flimsy and don't hold well if you want to attach them to a hat brim. The clip on the arc is excellent and holds well. personally, I find the multiple light settings, flash modes, etc neat but find that I don't really use them much. So I prefer the simple on off of the arc xxx.
I think the AAA size lights are nice, they have a good balance of weight and battery life. For winter, or if I was going to do some serious long night hiking, the AA size would probably be better as they have much longer battery life.