Raised Garden Beds

So I’ve been looking into raised garden beds to start a garden in my front yard (and to cut down on the mowing area). I’m going to be building a few beds out of 1′ X 12″ X 8′ untreated pine wood that was picked up at a local Menards store, but there’s also an affordable option on Amazon.com that I’ll be comparing it to. The Giantex Raised Garden Bed Wood Planter Box is made from fir wood which is a better quality wood to use in this circumstance. Fir has tight, close grain lines while pine has broad grain lines that wander which make it far weaker than fir. The soft wood between the grain lines shrink and expand, making the wood cup or twist. For stability and strength, fir is much less prone to warping or twisting, and much stronger than pine. I anticipate the pine to rot out or need repair before the fir wood box, and plan on enclosing/converting it into a tin flower box once it does. However, I am curious to see how much longer the Giantex Fir Wood Garden Bed lasts and see if it’s ease of installation and overall quality is worth the few extra pennies over the cheapest DIY box with untreated pine lumber.