If you're in the budget, right now is a great time to own an HID. LEDs just don't have the throw/power to reach out and touch someone because its light comes from a flat base- not in a suspended fashion like an incandescent or HID bulb.
Before I delve any further into this, I think you should know the five fundamental elements that makes for a great HID (in no specific order):
1. Reflector- A reflector should provide a high quality beam, whether it be throw or flood. IMO a good reflector can provide a little bit of both, but I prefer throw over flood. It's also a matter of personal preference.
2. Ballast- This provides and regulates power to the bulb. The wattage is how much power it can deliver to the bulb. A high quality ballast will stand up to shock and will last a long time.
3. Bulb- A good bulb will last for hundreds, if not thousands of hours. They are also very resistant to shock because there's no filament to break. Color temperature is an important factor to consider. Generally the lower quality bulbs tend to have a very high color temperature (6500K+). It's not to say blue-colored light is useless, it's just not the most ideal color for general use. Anything under 6500K is much easier on the eyes as well.
The focus is another thing to consider. If you want a pencil-thin laserbeam, go for it- but that's all you're going to get out of it. If you want more flood/spill, then buying a light with a diffuser option is optimal.
I would consider brightness secondary to a bulb's color temperature. An HID can have 5000 lumens, but if the beam's pencil-thin and it's bluer than anything, it's just not very useful for everyday use. If it's mostly a diffuse beam, it doesn't throw very far- which kinda defeats the purpose of an HID. Balance is key.
4. Build Quality- If you're a heavy user, IOW you drop your light a lot or put it through rough use, this should be a huge consideration. There are HIDs that can be completely submerged, and there are those that can't even be splashed with water. Some can be dropped from a short distance with no problem, and there are others that will break/dent upon impact.
5. Battery- Having at least an hour of runtime is optimal. A light that runs for about 10 minutes is pretty much useless.:shrug:
Getting maximum runtime with maximum brightness is the goal. Even better, if the battery can be switched with a higher cap battery that's always a plus.:twothumbs
Now to answer your questions:
Yes, the AE is
MUCH better in quality than the MF. The AE is built like a tank, I'm convinced it will survive an explosion. In fact I've dropped it on purpose on multiple occasions, and it lights up every time, no problem. It's also waterproof, and with the right battery it's submersible. The high quality reflector gives a nice combo of throw/flood.
In terms of tubular style HIDs and the 4D Mag length you stated, I strongly recommend the AE. Unfortunately there just aren't too many tube-style HIDs over 25W. The Wolf Eyes Shard 10W/24W is probably the next closest contender, but I'm not sure about the overall quality.
I wouldn't recommend a MF. Looks nice, but there are MUCH better lights out there. It's at best splashproof because there are openings under the head.:thumbsdow:duh2: The reflector is orange peel, so you don't get the good amount of throw. On top of all this they give bogus specs for their lights. They claim it's 35W and it pumps out 3500 lumens, but it's more like 2000~2500 lumens.
The Jil-Lite Eznite is another one to consider, but it's over $400 and it's a handheld 10W.