Chose your poison is what I say about them. I have both, the 84F and the BDA which are essentially the same gun made by Beretta. Do you want open or closed slide? Do you want a decocker that flips down or up? Do you want Nickle or Blued? Do you want the combat frame or smooth frame?
There are tons of versions and options. A true collector would have a lot of fun with them.
As to the guns, 13 rounds plus one in the chamber of reliability. I used mine for carry and travel for years just because they are small, decock, lots of firepower and are nicely made and travel well. Don't let anyone tell you that the 380 is "underpowered" when you can drop 14 rounds of it quickly and accurately with a little 84.
With the rise of the mini-9mm's (EMP, glock 43, or similar) I see the 84F being passed by. It has a chunky grip to hold 13 rounds of 380, is blowback which leads to a sharp recoil for the power level and not cheap because it is made of metal not plastic.
Myself? I stopped carrying mine routinely years ago and it morphed into a "truck gun" for business trips. Very easy to tuck in and carry when traveling. I would not sell either though. They are great little guns, good at the range, safe to handle and teach new shooters with.
Highly recommended to add at least one to your collection!