Most swiss watch companies share movements (Mainly ETA Movt's) Only a few high end companies Rolex, AP, JLC, Piaget, etc. have in house movt's.
For example Omega is actually part of Swatch Watch Group (Basically a Upgraded Swatch Watch) Other Brands of Swatch Watch Group are:
High-range
Blancpain
Breguet
Rado
Omega
Mid-range
Hamilton
Longines
Tissot
Low-range
Calvin Klein
Certina
Mido
Swatch
Tag Heuer is part LVMH, which has other watch brands Chaumet, Dior, OMAS, Zenith (Which for some time provided Rolex Daytona Watch Movt's)
Basically all swiss watches are the same, some can be better than others but it all comes down to personal preference. One watchmaker use to tell me if you want a watch that keeps time well, Buy a Casio Digital.
So choose whatever style or brand you like or can afford. Between Automatic or Quartz, I think Quartz keeps better time, Autos lose time but battery changes not reqd. My auto watches are sitting in my watch winder, while my quartz, I can just leave it on the table w/o worries.