My FI tried on most of these...
The Chaps Taupe was probably the most "dressy" looking. But the color wasn't what I was looking for.
On the hanger I really liked the Axcess one... but my FI is on the smaller side and it just didn't sit on him right. Even the correct size looked loose/baggy/sloppy. But I liked that material and color best for our beach wedding.
We ended up purchasing the Chaps Cotton Suit and really like it. It is not overly formal but isn't too causual either. Plus it sits really nice on him. And I liked the color, not too dark but not too light. They also offered a wide variety of pants sizes which worked well for our very different groomsman (who all got the matching pants).
Hope that helps! I would suggest dragging your FI in and having him try it on. They look so much different in person and on different bodies.