Hi duckkett313,
While I have not tried the two bed frames you link, I have tried and reviewed this one, which is quite similar, but solid wood. He were my thoughts on it.
Any bed frame you choose should have slats and supporting legs that are strong and rigid enough to support your mattress and the people sleeping on it. The slats should be spaced less than 3 inches apart, at least 5/8 inch thick, and ideally at least 2 inches wide. This foundation is a good example of a well-structured and well-built foundation. In fact, it may be the last foundation you ever need, as it will likely outlast several mattress cycles. While it does not come with a headboard, you can contact Mattress Foundations to discuss available options.
I am not entirely comfortable with floating legs. This type of leg is sometimes referred to as a load-reactive or pressure-activated support. It can cause a bit of flex in the mattress. Visually, it may create a minimalist floating look, but there are some potential concerns with this kind of construction. The frame must be precisely engineered to flex just the right amount. If it flexes too much, the bed might feel saggy. If it flexes too little, the legs may not engage at all. Over time, the repeated loading and unloading could wear down the contact points where the legs meet the frame. On slightly uneven floors, the legs might not engage properly, which could cause long-term stress on the slats or rails.
You should gather all the relevant specifications for the slats, spacing, and support legs to make a more informed decision about whether either of these options is right for you.
Hope this helps.
Maverick