19 months apart here (was supposed to be 21 months but DD was prem ) We didn't want any closer coz we didn't want to compromise that first year of breastfeeding. Turned out that we fed through the pregnancy anyway

Pros:
Got to tandem feed, which in turn has forged a pretty strong bond with them.
Very little jealousy because toddler isn't quite at the age to grasp that concept.
Agree about the sharing and learning it early.
While they're playing at different levels at the moment, that 'gap' will close over the next year or so.

Cons:
Toddler reaches tantrum age and wakes up the younger one during the day!

you know what.. I can't think of many cons LOL. I didn't have a problem with going out.. was happy to wear #2 while pushing #1 in the pram or trolley. #1 was happy to sit in a toddler seat anyway if I wanted them both in a pram. And DS wasn't that demanding of my time, no more than usual. I found it easy to entertain him while b/fing DD, I never had to have planned activities or anything for feeding time.

There's pros and cons for every age gap. I'm sure you'll enjoy whatever age gap you end up with

FWIW my bro is 5yrs older than me, and it took until the later teenage years for that gap to start to close up. So that made me want our kids closer together so they played better together at a younger age.