First thing: faster to the "you may now use your Kindle" bing. The new winglets mean that the planes climb quicker to that all-important 10,000 feet so you can get back to your fifty shades of whatever.
Second thing: new engines! Quieter engines, meaning you don't have to blast your iPod quite so loud. Engines that burn less fuel. Engines that (in the case of the MAX) have awesome scalloped edges, which is one of the reasons how they do those things and also look really cool.
Third thing: DOUBLE WINGLETS. Seriously, the 737 MAX has double winglets, that go up as well as down. We're betting that's why the MAX is in ALLCAPS, because it's EXCITED about DOUBLE WINGLETS. No, really. We can't wait for the first double winglet Instagram shot out of a window over some really pretty scenery. Or even boring, boring clouds. DOUBLE WINGLETS.
Fourth thing: bigger bins for you to carry all your stuff on board. Unless you're a super-frequent flyer or you pay up for early boarding, you know what it's like playing musical overhead bins, only to find that you're the last one standing and have to send your stuff down into the hold. Both new jets are planning bigger bins, so you (and that idiot with the "personal item" the size of Kazakhstan) can store all your stuff happily.
Awesome, huh? Also, WINGLETS.
[Images: Boeing, Airbus]