I've used t-111 for a few things. Good stuff, getting kinda expensive.(But, what ain't?) I used SmartSide panels for my coop. The stuff I used, has this old barnwood look. When I built the coop, I bought the 4X8' sheets for under $19 a piece. They have definitely gone up from when I bought them. Once installed, they make for great siding. They have a 50 yr guarantee, and on my coop, they have held up very well. Have to be careful with them before installation. If you drop one on it's corner, you will damage it. I had no problems with nailing them up. Did not have to drill any holes. Just nailed them up, like any other siding. Around the window, and other openings, I used aluminum siding J channel, to cover the exposed, cut edge.
Not familiar with the Redwood panels.