Here in rocky, rooty, hilly New England I don't see many standers. Local Scag dealer doesn't sell many. As an older operator I would rather be sitting!!!! If I were 40 years younger I may go for a stander, but not now!!!
I use machines with either a collection system or a rear discharge deck and standers don't have those options.
Local Scag dealer used to sell Wright Standers but discontinued them when Scag came out with their standers, but they haven't sold well either.
I can see an advantage to a stander on flatter and smoother lawns, but that don't happen much here in New England!!!
I mowed for many years(25) with two Ingersoll GTs both with collection systems, these machines were very effective and compact, however slow. I still have the "low time" machine with 2,700 hours, 2nd engine. When I upgraded to a ZTR it took me a long time to get accustomed to its operational characteristics, but now I won't be without a ZTR with collection.
Mad Mackie in CT