I'm building new shelves for my workshop. I'm somewhat new to carpentry, and am planning on using 2x6 uprights (1 front and 1 back) with dados, and 3/4" plywood for the shelves. I went to woodbin's Sagulator to get the thickness, but the only plywood option on there is fir plywood. I can't find fir plywood on the local stores websites, I mainly see Pine, CDX and OSB. Does anyone know which of these would be the strongest and hold up the best? It's a dry area, and the shelves will be roughly 2' x 30" and will have tools (up to 50 lbs) on them. I'm not too worried how they look, I just want them to function well.