Here in Canada the best one I found is called "Earth's Own". Its gluten free, and has a very mild flavour.

The taste of coffee can be improved a little bit buy sprinkling cocoa power into the foam of the oat milk. And optionally adding honey for sweetness.

Oat milk tastes a little different than regular milk. But its very close and foams very well. There might some difference, because I noticed the coffee would hit a little bit stronger with oat milk. Perhaps there's some chemistry going ... don't know why.

But the reason I switched, is because I was getting stomach cramps about once a month from cow's milk in my coffee. Would ruin my day. The only thing that help me with the stomach cramps was a bowl of rice for some reason.

Decided to try other milks to see if would fix my problem and it did. Never liked any other kinds of milk until oat milk. They add lots of chalk to the nut milks. So with oat milk you can avoid that too.

The only downside is the price.

This is true. Oatly actually makes a “Barista Blend” that foams up perfectly for cappuccinos or lattes.

If you want your coffee to taste like oatmeal, yes.

I partly agree with that. Although oat milk is not that strong in flavor as almond milk (at least for me), cappuccinos are very dependent on the milk used, to get the right texture, as opposed to just coffee+milk. So yeah, depending on the type of milk used, the results can go from great, to meh, to just "that doesn't feel like a cappuccino"

Personally I much perfer oat milk coffee than cow milk coffee, maybe depends on the brand? I'm using Karma brand from Switzerland's COOP.