Pros and Cons of Ultrawide vs standard monitors gaming?

I want to upgrade to a 4k monitor for my pc gaming. I do a lot of MMO's and RPG's. I've been looking at the Alienware 34 240Hz QD-OLED Curved Gaming Monitor but I am not sure if I should go with an ultrawide curved monitor.

Sure, I am sure its awesome for MMO/RPG games, but I also do online video podcasts and I stream as well. How does this look to people who don't have ultrawide monitors? Plus I play a couple older RPGs and am not sure how much trouble I will have making these older games work for a monitor like this. For newer games is the ultrawide THAT much better than the standard ones?

Anyone else use an ultrawide that can educate me a little? This is a sizeable purchase so I kind of want to make sure I don't regret buying it after the fact.