I wasn't sure if I'd really taste much of a difference between the coffee drinks, so I also brought along a friend who has received training in discerning tastes from a professional sommelier and recipe developer.

He found the 2% latte boring and lacking "personality." Adding sugar made the taste more interesting, but he didn't think he'd order it again.

I've been drinking lattes made with 2% milk for years, and I wouldn't buy one (sometimes two) daily if I didn't like the taste.

This was almost like the experiment's control group for me — something to compare the others to.

Although it didn't end up being the best of the bunch, it's a good choice for purists like me.

When I was drinking non-dairy lattes, soy milk was my preferred alternative. I was really looking forward to seeing if it was as tasty as I remembered.

Luckily, it didn't disappoint — I knew I was onto something back then.

My friend described the drink as smoky with chocolate notes. Although I hadn't noticed that before, I'm starting to think the hints of flavor may be why I'm drawn to it.

Sugar detracted from the taste of this one for me, which is also a plus since I'd rather not add it.

I strongly associate coconut with tropical drinks, so I wasn't sure how I'd feel about a coconut-milk latte. However, I was pleasantly surprised.

In my friend's words, the coconut milk had a dry, caramel taste with a slight acidity.

Adding sugar really brought out the coconut flavor, which can be a good thing or a bad thing, depending on your tastes.

For me, a stronger coconut taste was welcome. However, my friend isn't a big fan of coconut and preferred this drink without sugar.

I like snacking on almonds and was looking forward to a latte with a nutty taste.

Unfortunately, I didn't like it.

There was a distinct almond quality, but it felt a bit watered down. I didn't think the milk added much flavor to the latte, and my friend agreed.

We both thought that adding sugar would dramatically improve the taste, it didn't.

I enjoy Starbucks' iced brown-sugar oak-milk shaken espresso on warm days, so I was looking forward to seeing how oat milk translates into a hot drink.

Unfortunately, I was a little underwhelmed.

My friend said the oat-milk latte almost had a "cigar-smoke flavor," and neither of us liked that very much.

When I added sugar, the flavor was much better — mostly because it largely covered up the oat milk, making it taste closer to a 2% latte.

Although I'll still order it occasionally, the 2%-milk latte is no longer my go-to at Starbucks. After just one sip, I knew I'd be going right back to soy.

The delicious — perhaps chocolaty — flavor is perfect without any added sweetener.

Even though the coconut-milk latte wasn't my favorite drink, it was a close second. The tropical, caramelly flavors really work.

With sugar added, the oat-milk drink was also OK, but I didn't like the almond-milk latte and won't be ordering it again.