I heard my name was mentioned... hahaha
Yeah I am a huge fan of their watches.
Zenith is well known for their El Primero Chronograph movement.
Launched in the year 1969 (movement is called caliber 3019PHC then), it is one of the most robust chronograph money can buy.
Tested in real world conditions for over 40 years... and no known issues of chronic problems.
Widely accepted as one of the best chronograph movements ever made.
Accurate as hell due to the high beat (36k vph)
For their non chronograph, they have the elite movement... base movement is the time only elite caliber 680.
This base movement is used to add on many complications like power reserve, moonphase and such.
Same goes with the el primero, it is used as a base for many other complications like moonphase, triple date, annual calendar and so on.
With reliable base movements, I am sure they are reliable as well.
The Annual calendar Captain Winsor still is the cheapest annual calendar with and in house chronograph movement you can buy.
Currently, their collections cater to almost every category.
They have watches ranging from 38mm to 45.5mm...
Dressy (Captain Collection)
Sporty (Pilot and Stratos)
Historical (El Primero Collection)
High Horology (Academy Collection)
Do check em out and see which one you like.
Narrow it down to a few pieces and ask again.
Answers might be more specific.
Happy hunting.