I was just going to leave this thread alone, BUT
I have a pretty good collection of firearm, not as much as some people on here but I would consider it decent that I can say I have it when friends starts naming guns. when I think about it, I don't really have a "comfortable" preference.
I guess I would find a 357 magnum unbalanced and uncomfortable to conceal on an ankle strap :|
to respond to OP's post, Im more distracted on the word recoil from your post. If you really want no recoil then any .22 should do it, otherwise with the proper grip and arm extension, recoil is easily controllable.
Basing it on the popular concealed carry choices from this forum, i find the glock 23 with 165grain ammo with the most recoil of any gun i own but i seem to be more consistent on my spread compared to my match grade kimber 1911, i cant explain why. However glock 23 if paired with a 180grain becomes a much more manageable firearm.
This might help in terms of recoil