Most Northwest Arkansas homes wear architectural shingles, and for good reason: they're the most affordable system to install, they come in colors that suit any neighborhood, and a quality shingle with proper underlayment and flashing will give you twenty to thirty years here. Look for impact-rated shingles if you're in an area that gets hit by hail regularly; some insurers discount for them.
Metal roofing costs more up front but lasts two to three times longer, sheds snow and hail better, and reflects summer heat. Standing-seam panels with hidden fasteners are the premium choice for homes; exposed-fastener ribbed panels are the practical choice for barns, shops, and rural properties. Either way, metal is usually the last roof a house needs.
TPO is a single-ply membrane for flat and low-slope roofs, which means it belongs on commercial buildings, additions, and porches, not on a pitched house. It's white, reflective, heat-welded at the seams, and repairable. The failures we see on TPO roofs almost always trace to bad seams, clogged drains, or ponding water, all of which come down to installation quality.
The honest answer for most homeowners is architectural shingle unless you plan to stay in the house long enough to get the payback on metal, or your roof has a slope that shingles can't handle. For a business with a flat roof, TPO is the right call. Ask us for a written estimate on more than one system and we'll show you the real numbers side by side.