In reading t he OP,, it was quite plain that each gun had it's own niche & purpose.
The SP-101,, excellent carry gun, (despite the weight) and while "only" 5 shots,, is quite versatile.
As an instructor,, I tell students; "If your life is on the line,, you want a firearm that's easy to operate, and as infallible as possible. Unless you are going to become "motor memory skill friendly" (meaning LOTS of shooting to where you do not have to think to make it operate) AND can operate any firearm with ONLY your off hand, one handed, firing multiple shots,, then the compact DA revolver is the best option for that purpose.
The SP-101 fits the bill easily there.
Stepping up,, you have the GP-100. Basically a larger version of the SP-101,, and does have a 6th round. Again, very versatile & built like a tank. If a person can CCW a larger revolver like this over the SP, then it's a better choice. The GP-100 is a well proven, tried & true excellent handgun, with the capability of various ammo choices,,, so of the (2) Rugers,, IF,, IF,, carrying it for CCW is easy,, then it gets the nod.
Then we have the S&W 625. The largest of the (3) choices, in a fine caliber. Moon clips,, many poo-poo using moons,, (I used to be one) but they do offer a much faster reload than many understand. And, while a little bulky in carrying form, the moons pale in comparison to the size of carrying the 625 itself. The 625 is an excellent IDPA gun, and even though a little handicapped (number of rounds) it's still a fine USPSA competitor. I shoot USPSA, Revolver division, and I have a S&W 25, as well as a few other 6 shot DA revolvers. And EXCELLENT way to work on the "motor memory skills" too.
So, it comes down to the purposes for each intended firearm.
Each one of these guns serves a different purpose in general.
The SP-101, a solid CCW handgun, and easier to conceal.
The GP-100, an excellent all around, general purpose revolver.
The 625,, better as a companion gun for a 1911 or competition purposes.
So, my thoughts turn to this. What if your FUTURE desires or needs change & you find yourself in need or want of one of these guns,, and you lament; "I used to own one of those!" ??
It's called "seller remorse" and I discovered many years ago, I hated seller remorse. So, I quit selling unless I was 100% sure I'd never need that gun or desire that gun in the future. (Example; I won a Glock at a NRA event, and knew I'd never want or need it. I'm not a Glock person.)
I'd opt to keep all (3) gun, clean them, put them in a safe, use as necessary, and know that they do not eat anything, and in general, appreciate in value. Plus,, you may have a son or daughter who'd need one someday, or maybe a relative or someone who wants or needs one. Lastly, if you get to a point in life where you know your retirement needs aren't easily met,, then a slow selling of them can assist in living expenses. Or, in the case of your untimely departing of this world, your family can sell them to assist in sudden unexpected expenses.
Keep them all.