Thesis Director Necessary?

[Timshel]

I am asking this question again, but on this board, because I didn't get that many responses on the letter of recommendation board. Here is my original question:

Okay, I have a question about who to ask for my LOR. I already have my Master's in English, so I have written a thesis. My question is, does it look bad if I don't have a letter of recommendation from my thesis director? I mean, I could get one from him if I needed to, but I feel that there are other professors who would write better ones, especially ones that pertain more to the area I am hoping to focus on. My thesis director turned out to be a bad choice for my thesis as he wasn't as knowledgeable on my subject because I changed it midway through, which is why I would think other professors would be better. 2 of the 3 I plan to ask were on my committee, but neither were the director (the third being our latino/a lit teacher which is where I am shifting my focus a bit). I could ask my director, but he's incredibly hard to get a hold of, and he's not very reliable (he takes weeks to respond to emails and frequently misses appointments), so I'm scared to ask him. I know he really likes me, and would definitely recommend me, but he is like a semester away from retiring, and I only had him once, where as the other person I was thinking to have instead of him has had me several times, and I'm afraid he's a bit apathetic and wouldn't be as enthusiastic as she would (coincidentally his wife).

However, I do not want it to look bad if I don't have a recommendation from my thesis director. So basically, I'm just not sure if it is better to get letters from instructors who know me better and are more reliable, or if it's more important to get information from my thesis director. I really don't know what to do, so any advice is much appreciated.

The person who I was thinking of asking instead of my director was on my committee, and is my director's wife, so I could always ask her what she thinks, too, but I thought I would try to get some advice from others on here.