I went through a similar evaluation a few years ago where my old Ice Armor bibs finally wore out and I was considering a few different options. I had concerns that the Simms bibs wouldn’t be warm enough since everyone commented that they were lighter and less bulky. After 3 seasons with the Simms bibs, I can say that I’m happy with my choice. They have good knee pads, good waterproofing, are warm enough where you don’t have to layer up underneath them and are all around what I was looking for(This is coming from someone who has average body temp. Not someone who is chronically cold). The ONLY thing I don’t like is that my Ice Armor bibs had a zipper pocket or two on the chest which I miss having. However, looks like the new Simms bibs have gotten rid of the open hand pockets on the chest in favor of the single zipper pocket. They are comfortable and not too bulky in the boat as well, which is nice. OVERALL, I think Bearcat is right that you can probably make your choice on style preferences and what kind of deals you find and will be happy with them.