What are the pros/cons of the various BMW E39 replacement water pumps?

What are the pros/cons of the various BMW E39 replacement water pumps?

I'll start with an overall summary (based purely on Internet research) but I don't profess this keyboard list to be accurate (until vetted by you guys).

I think these are the fundamental options:
a) water pump, paper gasket, & rubber o ring with composite impeller (OE & OEM & OES & OES Replacement)
b) water pump, paper gasket, & rubber o ring with metal impellers (Aftermarket)

Are these the known suppliers? What are the pros/cons of each?

BMW E39 Water Pump Suppliers:
--- top tier (I think) ---
1. Stewart EMP (some say they beef up the bearings to handle the metal)
2. Hepu (Cam like's em but I don't know much about 'em)
3. Geba (heavy cast metal impeller, bearings sometimes fail)
4. Graf welded steel impeller (better but also occasional bearing failure)
5. GMB (I think this is OE with composite plastic impellers???)
--- lower tier (I think) ---
6. Hella (I think this is OEM with composite plastic impellers)
7. Bosch (I don't know of any users who reported back on these)
8. Beck Arnley (they sell 'em but I don't know anyone using them)
9. Airtex (again, they sell 'em, but we'd have to hear from users first)
10. AC Delco (same as the last two above, they sell 'em)
11. A1 Cardone (they sell 'em, don't know much about 'em)
12. ??? please correct this list as needed so we all benefit ???