I prefer to cut each piece exact before any sewing. For me it is faster and more accurate than having to square up after pressing and sewing.
The way I see it, if you add a bunch of blocks to one strip, then press, then true/trim, if you are trimming anything, it always seemed to be the width of a previous strip and not just the length of the strip just added. Maybe the edge of the block stretched or something. Sewing the pieces cut to length proves the accuracy of your seam allowance. I would teach beginners to do it this way so they master the 1/4" seam allowance.

I precut my strips but I then finish one block at a time. I tried doing it assembly-style but kept getting confused.

Log Cabin is one of my very favorite patterns. I have made 3 Queen Size Log Cabins so far and have done Eleanor Burns every time. I always have trouble keeping it square, the one good thing about the Log Cabin is that it's a very forgiving pattern, so you don't really see "wonky". I have a gorgeous collection of the Northcott Stone fabrics and this time, I am going to try the paperpiecing method. This one is actually going to be for me and I'm going to make it perfect if it kills me, lol My question is this................is there a PP version for a 12" block? The one I have is 6 3/4. Thanks Wendy

I chain piece and trim up after each block has the newest strip attached. Never had a wobbly cabin.

I recently tried the Eleanor Burns way and thought it was much easier than precut ting the strips.

I precut, but use the QAYG method, one block at a time. I use the "no sashing" method of QAYG.

I love people who come up with such great ideas. This method may change my mind about making log cabin quilts. Thanks!

I love the Eleanor Burns way also, I have plenty of her books to keep me busy for a few lifetimes

I happen to be working on my 1st log cabin. My DH cut strips for me. I feel doing it any other way would not be good in case something was off just a smidge, It would cause problems. It may have been a longer way, but, it was strips for me.

I just finished a floral log cabin, and just cut all my strips 2 inches wide, sewed them on, and then cut the length. To keep from getting confused, I sewed the same strip on all 64 blocks in a sequence before adding the next "log." It's coming back from the quilters in about 2 weeks. I didn't look wavy to me, so hope it doesn't when it's quilted either. You guys have me worried now!! : )