It really doesn't matter what people suggest if it is not available in your area. Stone availability and price varies widely between regions. Your best bet is to do exactly what your wife is doing, visit all the stone places and see what looks right.

I am renovating our pool after 18 years and trying to decided on travertine or leuder coping. We are using gemstone designer series in the pool area. We had limestone coping but it is chipping and just does not look good anymore. Which product will last longer and more durable? Help

We did stamped concrete and brought it up right to poolside. So, no typical "coping" per se. Just the concrete rim around the pool. This photo is stamped concrete. This one is more of a bullnose edge. We did a square edge. You can still select a beautiful tile rim just below the edge. We also edged the steps with the small version of the pool tile.

I am not a pool expert but can you have a custom concrete edge made? I am in the decorative concrete business (metallic epoxies) and have been in awe of a concrete artisan out of LA - maybe he can connect you- this guys work blows me away https://concreterevolutionllc.com/ "Stamps have long been a popular method for giving concrete an authentic wood-grained look. But a newer method, developed by Concrete Revolution LLC, New Iberia, La., adds even more realism to the process by allowing the installer to be in complete control of the wood-grain design and texture "