Look through the archives here and you'll find tons of information.
One set of strong opinions you'll find here is that a shotgun with only a pistol grip, no buttstock, is a bad idea. If I recall, the Mossberg Cruiser is a bad idea pistol grip only model. I think the Persuader has a full buttstock which is a good idea.
Unless the labels say something different, the stock barrel on those guns is usually a cylinder bore (not choked), smooth bore that will work just fine with just about any shotgun ammo including slugs, buck, and birdshot.
If you can get a really cheap price on the pistol-grip-only Cruiser, go for it and then buy my spare full buttstock for cheap also.
--Bruce.