D25A, I own both the lights you speak of. At the end of the day, I like the UI of the D25A. Not to even mention, you can get the D25 in Gods Metal, Ti. IMHO: It is well worth the few extra $$ to upgrade. If you do, you will have a really unique light that looks as good as it performs.
Boring other reading material:

I also think you would find the LD11 kinda chunky for a keychain light. The D25 has a slightly more streamline design. I would call it more keychain friendly. Also, you may find the twist/click UI of the D25 is easier to wrangle on your keys vs just a tail click UI. Imagine using the D25 and the LD11 with keys attached. If you click the D25 on, you can then palm the keys and manipulate the modes using a twist of the head. VS the LD11, where you have to keep trying to click the rear switch to change modes. Just a thought.
Another way of thinking about it. Lets say the performance and quality are equal: The Fenix has more of a tactical look (which you may want?), while the D25ATi can have that tactical UI with a classy EDC look. I like that the D25Ti is just at home in work attire as it is camping. I am not sure if you have ever owned a Titanium light, but it is hard to describe how it feels in ones hands. To me feel of a light is important, and the D25Ti is a show real stopper.
A footnote on potential D25 "problems:. I have owned 5 of the D25 lights. I think I still have 3? Anyways, the only issue I have ever had was that the light needed the threads & switch cleaned rather often. I find it is a tad more sensitive to dirty threads or switches than others. It could be that I carried it in my lint filled pockets often, and the twist UI design? Either way, it was no big deal. I also wonder if the UI is hard for some folks. Meaning a operator error could be to blame for some of the issues or problems people report they have.
To me: the Fenix is just another 14500 compatible AA light, the D25A, in Ti, is in a whole different class of lights. Either light, you will likely be happy with your purchase. Another idea, buy both if you can afford it, then sell or gift the one you least like???
Bottom line for me: The D25ATi is one of my favorite AA lights and I own tons of them. If you shop it, you can sometimes find the previous year model D25Ti on sale. I think I bought my 2014 model last December 2015 from Going Gear for $39.95. It was cool white tint (all that was left), but that is a smoking deal. I know a few other members here snagged one too. They are sold out now, but shop around is what I am suggesting. From what I recall, GG does that sale at the end of each year. If they do it again this year, I am going to pick up the 2015 model. lol
Hope that helps give you some extra things to think about. Good luck my friend.