There is quite a difference between the two guns you are looking at.
The Remington is a 2 3/4 and 3 inch gun. With a 23 inch barrel it will be alot easier to carry and swing as it will be much lighter than the Winchester. The Super X2 is a 3 1/2 inch gun with makes it heavier. The Super X2 is the same as the Browning Gold Series (Winchester and Browning are the same entity now.)
If you want to goose hunt with it you MAY want a 3 1/2 inch gun. Personally I don't think you need a 3 1/2 inch gun to shoot geese. However, the gun and ammo marketing people have got alot of people thinking that they must have a 3 1/2 inch gun to shoot geese and ducks.
The Remington 11-87 is a time proven design based on the 1100 and will shoot all loads without a problem. The 23 inch barrel will make it easy to carry all day long. The English style (no pistol grip) stock will make it easy and fast to shoulder.
Here is the 11-87 Upland Special and specs:
Ga. /Chamber Barrel/ Choke/ Mag Capacity/ Length/ Weight/ MSRP
12/ 3"/ 23"/ Rem Choke/ 4/ 43 1/2"/ 7 1/4/ $756
20/ 3"/ 23"/ Rem Choke/ 4/ 43 1/2"/ 6 1/4/ $756
Now that I have gone to the Winchester website I see that the Super X2 is available in a 3 inch chamber as well. So, I stand corrected.
Here is the Super X2 3 inch and specs:
Ga. /Barrel/Chamber/Choke/Length/Weight/MSRP
12/ 26"/ 3"/ Invector+(3)/ 47"/ 7.25/ $819
12/ 28"/ 3"/ Invector+(3)/ 49"/ 7.5/ $819
Here is the Super X2 3 1/2 inch and specs:
Ga. /Barrel/Chamber/Choke/Length/Weight/MSRP
12/ 26"/ 3-1/2/ Invector+(3)/ 47"/7.75/ $936
12/ 28"/ 3-1/2/ Invector+(3)/ 49"/ 8 /$936
The Winchester has a higher magazine capacity (5) than the Remington (4), but who shoots 6 shells in one volley these days (except for spring snow geese)?
Anyhow, there is my take on your question. I am biased personally towards the Remington. I have an 11-87 and grew up shooting Remington 870s and I love them both. The Winchester is nice but it will cost more and is uglier.
As far as barrel length is concerned, I think it is up to the preferences of each shooter. If you are used to a 30" barrel you may be surprised by how the 23" barrel swings and feels. How you are surprised is up to you; whether or not it is love or hate. Good Luck!