I chose the ASI-533MC-Pro because of the square sensor which is more forgiving about edge aberrations than a rectangular sensor. I also like the way most objects frame in the square field...there is a lot less wasted "real estate". Some scopes may not even need a flattener or coma corrector with the ASI-533. The camera having little or no amp glow is a big plus and it also has a 14bit ADC, 50Ke well depth, cooling and very low read noise. It came with a "cloud curse" (at no added cost) so I have not had much chance to use it yet. Once the Covid thing goes away I am anxious to get out to the dark site to properly try it out. I sold an ASI-1600MC-Cool to get the ASI-533MC-Pro even though the sensor is a bit smaller.
This test shot of M3 is 60 x 10 seconds with an old Ultima 8 SCT @ F10 no darks or flats. taken from my Bortle 5 "garden".
My $.02
John Love
CCD-Freak
WD5IKX