I have used a SMD Lunar Solo for the past 4 years. It is my go-to one person shelter. I have also had recent experience with the Lightheart Solo (Cuben) and the BA Fly Creek UL1.
As others have said above, Big Agnes makes tents that are, for my purposes, kind of "meh." The Fly Creek is light, sure, and since most of us grew up using double-wall tents with an aluminum pole structure, it is comfortably familiar. However, the tent itself is not particularly comfortable--especially for long term use. You have less interior space and headroom than you'll have with the other two, and that makes a difference. The vestibule is tiny on the Fly Creek, and the door does have this habit of dumping water into the tent. Also, I much prefer a side-entry to a front-entry. Easier to get in and out, and you don't have to sleep with your stinky shoes right next to your head! A lot of people upgrade to a UL2 as their solo shelter, because the UL1 is pretty cramped.
LH and SMD both make fantastic tents. The set-up is pretty intuitive once you have a couple of practice pitches under your belt. I wish the Skyscape had existed when I was in the market for a one-person shelter; it improves on the Lunar Solo in almost every way I can think of--better head room, better usable interior space. SMD tents strike me as marginally better-constructed than LH. Just the quality of the stitching, all the little design elements, etc. I have been told that Lightheart uses a silnylon with a slightly higher hydrostatic head, meaning there's less chance it will mist through in heavy rains (I don't think my Lunar Solo has ever misted, and it's seen some serious all-night downpours in New England, Oregon, and coastal Spain).
Overall, though, any of these would be a fine choice. All good in wind and rain. I have put in 2000+ miles in my SMD tent, and hundreds in the BA and the LH. To me, the LH and SMD look like bargains next to the BA.
The only thing I would add is that if you really want the comfort and flexibility of a true double wall, look at TarpTent's designs--the Notch, Moment DW, or the StratoSpire1 look like they could all work for you.