You owe it to yourself to give one a try!
I like shooting, and most all the different aspects surrounding guns. When my father retired, he would take scenic drives around the hills in North Carolina, visiting historic sites, state parks, and gun shops. He'd jawbone with the fellers, and if something interesting was on the rack, he'd buy it.
Then he'd go to the range and shoot a bit. He enjoyed stripping them down and learning how each mechanism worked. Learning about the mechanical engineering of older firearms is a great hobby.
Some of the guns he loved and kept. Most of the rest, he'd give to me so I could do the same. Then we could talk and argue about 'em. I'd keep the ones I loved, and sell or trade the ones I didn't. He said he'd rather do that than leave me a big inheritance, because he would not be around to share in the fun. I miss the guy, he passed away a few years ago.
Two years ago, one of the members at my shooting club put his CZ Bobwhite G2 20 gauge up for sale. He told me the gun shot fine, but after shooting an entry level side-by-side, he wanted to get a much finer side by side and had his eye on an AYA. I picked up the used gun at a fair discount. I thought it would be fun to try, learn about, and if it didn't win my heart, I could always pass it along to another curious club member. At the price, I thought it might be a good gun for bad weather when I didn't want my beloved shotguns to get wet and frozen.
The 20 gauge Bobwhite G2 fell into an uncomfortable middle ground: I like it too much to take out in Wisconsin rain, hail, snow, and "winter mix". It's not got lovely hand checkering or beautiful engraving. It's not a dainty light-weight like those nice Spanish, Italian, or fine old American side by sides. But it's got choke tubes for flexibility,and is rated for steel shot and 3" shells. It swings nice, I can hit with it, and makes me smile when I carry it, action open, across my arm. Of course I detail stripped it to give a super deep cleaning and learn how the mechanisms work.
Two triggers? COOL! A new thing to learn to shoot, and it wasn't hard to get used to. Now I understand. You just have to try 'em to really feel the... the... reasons. The lockwork is smack-your-head simple. Brilliantly simple. And if something breaks, chances are you still have one barrel to finish the day's hunt. Brilliant.
3" 20 gauge... it can throw 1 1/4 ounces of lead at 1330 fps. Just like my 12 gauge guns. The CZ 20 weighs 6.75 pounds. That's trim, for a 12 gauge. I think of that CZ as a fine light-weight 12 gauge... it just has smaller bores.
But to be honest, that CZ isn't quite as nice as my Italian over-and-under. But the Italian costs more than six times as much.
I don't hunt ducks yet and don't know about 28 gauge, other than they charge a lot extra for less steel and smaller holes. Oh, people that buy 28 gauges don't seem to turn them over very often, either.
If you get yourself a CZ Bobwhite G2 new, it will run you about $725. You can shoot it a few years, and if you don't like it, sell it for ... what you paid for it.
My only firm advice:
If you really want to experience a side-by-side, get two triggers!
Takes about 6 shots to get comfortable with, fun, traditional, and a brand new aspect of shotgunning to experience.
Barrels left and right vs up and down... about as much difference shooting as cericoated vs blued steel.