For skeet, get a skeet choked bbl. For trap, depending on distance, M, Mod Trap, IM or F will do.
A bbl with RemChokes may be all you need. I prefer a bit shorter bbl on my skeet side but you can do boht nicely with a 26" (or 28") RemChoke bbl.
Some folks think a longer, and therefore heavier, bbl helps you swing and get on target and give follow through. ...... As many answers/opinions as trap and/or skleet shooters. They are all right .... for them!
PS: I use 1100's for trap and skeet (O/U, pump, single bbl, ..., too) .. but an autoloader will do both jobs! 1100 is a great choice. Enjoy!!