All of these are good to excellent calibers.
The ST16 is your basic entry level caliber that has about 2 dozen configurations.
For me, the ST2130 is probably my favourite; being hi beat at 28,800bph, auto and what powered my Dragon King Diver ...

Unfortunately, in a moment of insanity, I traded it away

 

I think it really depends on how well regulated a particular watch is. Naively thought, and all else being equal (which it is not, comparing different movements) larger and higher beat movements should have an easier time running more consistently.
The ST36 variants are 1940s pocket watch size, the ST19 is a 1950s column wheel chronograph, Alpha-Getty already talked about the ST16 (basic, but that doesn't prevent it from being regulated very well) and the ST21 (modern high beat).
There is also the ST25, with a different balance bridge design, but not high beat.

 

The ST25 is probably one of the few recognizeably all Chinese designed and built calibres.

 

Don’t forget the ST17xx calibres in your list, which are often found in watches with “small seconds” dials.

 

Don't forget the ST17xx calibres in your list, which are often found in watches with "small seconds" dials.

I have one that is 10 years old and remains within 2 s/d.

 

Sadjoe--

FWIW, in the last year I've bought two Seagull watches--one with the ST1812 movement, the other with the ST2130 movement. Both keep time within +/- 2 sec./day, which is well inside the COSC standard. That's time keeping in daily wear, not formally tested. Both watches are attractively designed, classical and conservative, certainly not clones or homage watches, but very much consistent with the traditions of Western watch design.

The one with the ST1812 movement cost just under $400, the one with the ST2130 cost just over $250. The next watch I buy will most likely have a 1901 movement and be in that same price range. From what I can tell, Seagulls are expensive compared to other Chinese watches and a bargain compared to European ones. For reference, before I started goofing around with Seagull, I had been wearing a Stowa and a couple of Omegas over the preceding 30 years. My impression, as a customer and owner of daily wear watches, not a collector or an expert, is that the Seagulls are comparable to their European counterparts. I assume it's safe to say that that here, although I image it might trigger a fecal weather event in some other forums.

 

The ST21 series are clones of the ETA 2824 and operate exactly the same including the instant date change at midnight. I have a few watches with it and they all perform comparably with the ETA.