If you're lucky to be near a homebrew shop, the next time you're in simply taste the malts. I get more grainy out of regular 2-row. I love the taste of Maris Otter (I could simply dump milk on it and enjoy it for breakfast!). I really enjoy the side-by-side tasting of the grains when I go to the LHBS.
I try to taste everything in the brewing process, from the grains at the LHBS to the specialty ingredients to the wort to the gravity samples, everything.
Maris otter to me means more biscuit/bread flavor than regular 2-row. I think that for me, maris otter generally isn't for IPAs or hoppy pale ales. Maris otter is great for beers that you want more of the malt to shine through, English styles being a great example. I made a maris otter/willamette smash beer and the maris otter totally overwhelmed the hops. It was plenty drinkable but the mild willamette (in the quantities I used) didn't have enough gumption to overcome the malt flavors. Note to self: use stronger/more hops in any future smash beers with maris otter.