Funny...I was just thinking about this topic. What a coinkydink!
I've made a few log cabins recently and I've been tying, instead of quilting them. I've found that after a few washes, the larger blocks are having some issues with unattractive wrinkling (vs. cute puckering,) and are not holding together quite as well as a quilted piece would. However, the smaller block quilts, which are tied closer together, are doing fine. So, I would suggest a smaller block, if you plan on tying your quilt.
~ Cindy