The Sonax products that AGO are selling is the top products Sonax are haveing. They are a big brand and have many other OFC products that is just reaching okay. But they have really steped up their game over the last years. And much of them you have available on AGO. The other great products that are not sold on AGO I think is because of they are not voc compatible. It's mainly cleaning products like degreasers.
There where a system which worked great to work by hand. Many used this in Sweden during the 80s and 90s by hand on their single stage paint that was oxidized. They are still available at the gas station shop here. Know you have better products and the longevity of protection is greater. Sadly many compare Sonax products from this time. But as said they have developed many great products know like PNS, BSD, polish and compound Cutmax, Cut&Finish, ex04-06 and perfect finish. Their cleaning products wheel cleaner plus, glass cleaner, textile cleaner for alcantra, multi star APC and engine cleaner. So you guys have their great products available and can't go wrong with either of them. I think that Easy Shine is from one of the old products that worked great and by hand on oxidized SS paint but with a upgraded protection in it.
Meguiars has a price setting in EU and most Scandinavia that is at high end products. You can tripple the price on what I have to buy it to and sometimes four times and double the cost. They have some great products but with the prices over here they compete at another level of brands. The prices over all is very low in US.