You should be comparing the 43 and the shield. I sold my shield a while back and got a 43. Couldn't be happier.
If your doing this, I'd suggest looking into the Springfield XDs. Single stack with a 3.3" or 4" barrel and 7, 8 or 9 rd mags. Here is my review on the 4" XDs.
https://www.indianagunowners.com/forums/ingo-real-world-reviews/389445-review-xds-9mm-4-0-a.html
Shoot as many as you can and pick the one you shoot best.