Consumer Reports (https://www.consumerreports.org/join - $10/month digital) has reviews of washer/dryer pairs. You can find stackable pairs and read the washer and dryer reviews individually. Once you've narrowed down your choices, you might read consumer reviews on sites such as Home Depot and Best Buy.

Many washers/dryers can be stacked. It's a pretty common configuration. Ask your local appliance dealer, if the models that you like have a compatible stacking kit.

Without any more information about what is important to you, it is really hard to make a recommendation. You don't even tell us whether you want a gas or an electric model. Let alone give us information on desired features, price range, capacity, dimensions, ...

I can tell you that we have a stacked gas-powered Electrolux W/D combination that has been worked extremely well for our family. But that information is bound to be of really little use to you.

@rococogurl wrote up this article for atticmag several years ago. here is the link, very good article:

https://www.atticmag.com/2016/06/best-front-load-washing-machine/