I guess "Favorite" for me means versatility so trip prep can be "grab it and go" and I don't have to carry so much specialty stuff with me. Looking at what I've been using over the last several years one item that works well for me for any type of stream and even salt beaches is my Hazard 4 PlanB-17 tactical ambidextrous sling pack.
Vests are great at keeping nearly everything needed to land fish and re-rig at my fingertips. A vest with a backpack will comfortably carry everything I need over a long day with several miles of hiking-wading (potable water, food, jacket + some essential emergency gear) but backpacks can be uncomfortable in hot weather and I have to take the pack off to get something out of it.
Unlike a vest alone this sling pack comfortably carries everything I need on a long day for several miles of hiking & wading. Yet with the padded semi-rigid horizontal dividers when stuff I don't need for a short day is removed the pack itself is not so voluminous or heavy that it makes me want to use something smaller for shorter days-trips. I do have everything I need to land a fish at my fingertips on the shoulder strap but it doesn't interfere with vision of my feet like my chest pack can.
The tactical MOLLE webbing, exterior flat side pockets and compression straps on both sides, and a big velcro loop patch on the back of the pack creates all kinds of versatility for secure permanent and temporary placement of foofaraw on retractors anywhere on the pack's exterior. I can just rotate the pack to the front without having to exit the stream to reach anything I need to re-rig.
I cast right/reel left so the ambidextrous feature of the pack means I can have it over my left shoulder which doesn't interfere with casting arm motion. And the net on a magnetic release hangs down on my left side where I can easily grab it with my left (non-rod) hand. Plus this is the only ambidextrous pack I could find that allows me to secure a water bottle, extra (T-)rod(s), net, and other accessories anywhere on the exterior of the pack that they are the easiest to reach when the pack is rotated to the front.