You have asked a strange question. There are many single stage presses that offer no particular advantage over the others. Mature and highly developed but simple products are all going to be very similar. Many guys dislike the RCBS Rockchucker because it drops primers on the floor. But I don't care because I deprime manually.
All those other presses did not exist when I bought my press so I had fewer choices. My 1971 Rockchucker is still in good condition and does all of my operations well. There are other $80 to $300 presses that will do the same job.
Some might do it a little better. However I see little advantage to buying a more modern competitors's press.
I do have other single stage presses for specific purposes.
I have a small Harrell's C press that is only suitable for seating bullets and neck sizing at the range. That little press has a clamp that permits me to clamp it to the table.
I have an RCBS A2 and a RCBS A4 BIG MAX that are very large heavy duty presses that I bought only to form cases. I have never loaded ammo on them and I never will.
I have an RCBS JR that can be used for pistol ammo or I can loan it to a noobie.
I have a chumpy cheap Lee press that is only used for a ram priming process. And I have a Lee portable hand press. Neither serve much of a purpose. I was given them by a friend's family after he died.
Some people have other preferences. If you buy most any good press you will not care what others use.
The main functional differences have to do with
1. Compound linkage for higher sizing force (heavy duty use) vs simple linkage for light duty use.
2. A O frame design vs The open C frame.
The O frame does not spring open under a heavy sizing load. The. C frame will spring open but it is still ok for pistol ammo.
3. Cast iron vs aluminum press frame.
Cast iron will last a life time. Aluminum will spring open. If used long enough aluminum will break.
There are other small features that may matter to the OCD people. Eventually those small features are only a matter of personal taste.
In the end all the press does is hold a die and permit you to force cases in and out of the die.
That sounds like why you prefer a single stage press generally. My question is about why one would prefer one single stage press over a different single stage press. .
Apparently, this is a very difficult question to ask!