@remnant72 One thing to watch out for with oatmeal is that it’s meant to soothe irritations, the oatmeal leaves a film on the skin to protect the irritations and the film can build up with repeated use and actually cause new irritation on healthy skin. But also know that most shampoos don’t even contain enough actual oatmeal for it to even do much it’s usually heavily processed. If you do go with an oatmeal one watch for bumps and itching closely.
I’ve been a groomer for 15 years and have tried so many products. Hydra is my all time favorite brand, Botaniqa is newer more natural and less fragranced and really good. iGroom is also top notch! If money isn’t a factor look up Doglyness. Many groomers swear by it but it’s insanely pricey I haven’t been able to afford it, hoping to someday!
You linked a brand that seems targeted toward doodles so if you have a long haired dog I would HIGHLY recommend also buying a conditioner and a leave in spray for detangling as well.
If you do have a doodle I would also recommend something stronger for ears beards feet and butt, I use Chris Christensen clean start for these areas that are extra stinky thick and greasy. Then you can use a gentler shampoo for the whole body. If you use a stronger shampoo on the whole body make sure to let conditioner sit a few minutes to keep the skin from drying out.