Well...lets break it down further. You can classify them all in cost/quality and other ways if you choose.
For the Cost/Quality you have the Mercedes........CZ83, Beretta, BDA and Sig. Some will scream "Walther" but Ill get into that later on.
All are first class guns that will give you light years of accurate and dependable service. All are extremely well made and you can tell when shooting and looking at them.
(The Walther fits this class in cost and quality of make..but are not in the general class of dependability as the others mentioned. Unless you are lucky! I grew up shooting one of these and have the scars to prove it..they bite!)
The Sig is equal to others in machining, trigger, finish and accuracy. Not in capacity and how heavily they are built. The CZ, BDA and Beretta are all very sturdy double stack guns and can hold up 15 rnds of +P .380 ammo. These guns are NOT much larger than the Sig...compare them first hand and youll see. The sights, triggers and ergonomics of these are first rate.......the CZ83 and BDA are what "ALL DA triggered guns" should feel like when you pull the trigger!
The CZ83 is the best natural pointing gun Ive owned and Ive owned alot of guns.
Now you get into the Nicely made and priced guns, Bersa, FEG, Makarov etc.....the Bersa is a nice weapon for the money...no arguements. FEG's are cheaper, just as reliable and much heavier built than the Bersas.
But dont have the nice trigger and sights. I refer to the PMK/SMC series of FEGs...nice design and an all around nice gun. Its more elemental than the Bersa in its controls function and such. The Bersa is equal to the Sig for feel of the trigger pull, sights etc. The FEG's are not. Its a trade off. Personally, I love the little FEGs and if they came with better sights/triggers for another 50-75$ they would take over this market sect...IMO anyway. Makarovs .380's are the same as the FEGs but a more simple design. They can have very nice triggers with a little work. They are also as accurate and as reliable as ANY gun mentioned here regardless of price.
Ive owned most of them and have shot them all. For my money, which I spent as wisely as I can........It comes down to two guns for best out of the box...no work done to them! The CZ83 for the "best of the best"......regardless of price! And the Bersa if price becomes an issue
Shoot well........................