B.W.
Hi, L.
Personally, I love the diaphragm. I've used it for decades (yikes! but, hey, I am 47). I used birth control pills but didn't like messing with my hormones and the last go round I got incredible migraines. Not worth it!
The diaphragm can be used as needed, which I prefer to taking pills everyday.
I used to use the jelly with the diaphragm but switched to the film a few years ago. I highly recommend the contraceptive film (sold at Target or Walmart). It is not messy, itchy or smelly, like the jelly. I just place it in the diaphragm before insertion. It is actually made to be used alone but I prefer the added barrier of the diaphragm.
I imagine you could also use the film with the diaphragm-like cups called Instead (actually made for menstrual use but looks like a small diaphragm - also sold at Target or Walmart) just to hold the film in place since it does liquify when warm.
I've never had any surprise pregnancies so this method has worked wonderfully for me.
Good luck!
B.