Swimsuit questions! Help!

Hey all!

My twin girls will be 18m in July. I’ve been looking at getting them a few swimsuits but Im having a hard time deciding what to do. To me a 2 piece makes complete sense because of diaper changes! But I see all of these one pieces that I know probably just fit better and stay on great but the thought of having to change their diapers with them in a one piece on those Long Beach days,has me shuttering! Am I missing something?! Obviously a rash guard swimsuit will be in the Arsenal for coverage, but can someone shed some light on day to day swimming stuff. I’m also aware of swim diapers both disposable and reusable, and while I realize the amount of changes may be more limited with these but with having twin toddlers I’m really looking to make me life a little easier lol So I would love to know everyone’s overall opinion on one piece vs 2 and also which swim diapers you prefer. Help a 1st time twin momma going to the beach out!!