I have owned 4 SxS's; 1 CZ Bobwhite and 3 Spanish Ugartechea's. I have also patterned an additional 10 or so that my buddies have from AYA's to Grulla. About 1 out of 4 or 5 will be well regulated where both barrels hit to the same point of aim. Most don't and when you pattern them be prepared to be disappointed. Most guys that shoot a SxS are for form over function. Often the right barrel will shoot to center point of aim and the left barrel will be off, usually low. It's a rare gun that fits a shooter and both barrels shoot to center, this is why most folks struggle with shooting a SxS, if they cared to pattern it which most don't. One of the Ugartechea's I had shot ok, still a bit off but good enough that I used it for a season. I sold all the others immediately after patterning them. The one I kept was a 12 gauge with 26" barrels, had ok wood. On a wild bobwhite hunt in Oklahoma, the dang thing started to shoot both barrels when one trigger was pulled. Talk about kick! That was my last straw with SxS's. I got back home, had a gunsmith fix it and I sold it. I shot them ok, but I think I am done with SxS's.
I have had much better luck with Over and Under's. Most of them are well regulated, especially good brands like Browning and Berretta, I have patterned probably 12 of these and they were all well regulated. The O&U CZ's are generally well regulated although I patterned one that was not. I own a couple Citori 725 Feathers and that is the gun I prefer. I will say I had to change out the lower firing pin and springs on both of them as they pitted overtime and I had a couple failure to fires. It was easy to do but if you think double guns are bombproof I would argue they are not and can have issues.
If you are looking for fancy wood, nice lines, and value the looks over the performance then go with a SxS, just be prepared to miss a few more birds unless you get lucky and find a good shooting gun. Most SxS guys are fine gentlemen and don't care about limiting out as much as just being out and about. That is not to say that there are not good guns out there, ya just have to search for em.
If you value function over fanciness then a good solid Over and Under is your ticket. Olympians win gold medals with over and under's for a reason. That's my soap box speech!