Both styles you've chosen are good for DIY. The pros and cons of each.
Kahrs floater:
Inexpensive but good to high quality, installs fast and easy (for the most part), great over concrete slabs, square edge (no grooves between planks), can be refinished, engineereed flooring is more stable than solid. Cons; can sound hollow, uses bulky transition moldings at doorways and meeting other floors, has the 3-strip "Pergo" laminate look, Kahrs doesn't use the "enhanced" urethane floor finishes which make it's finish a little less durable compared to the most durable (Award's Ceramix).
3/4" solid:
Pros: the real deal (3/4 solid oak), fairly easy to install for DIY, can be refinished many times, lots of choices in colors and styles, timeless design, moderate cost, easy to repair compared to floater or gluedown, solid feel.
Cons: Can't go over concrete without expensive new plywood subfloor, less stable than engineered, prefinished has grooves between boards, usually more expensive than Kahrs builders floater, takes more time to install than floater.
These are not all the pros and cons of each product but just what I could think of at the moment. Others can add to this I'm sure. My personal preference if it was going in my house: If I was on a slab, I'd go with the Kahrs but would chose one of the single strip designs. If not on concrete, I'd go with the solid 3/4" nail down.
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