Looking to purchase a watch for around 8k for myself. Currently looking at these 4 primarily but can’t decide. I am open to suggestion for other watches around 8k or below. Please let me know if any of these watches should be avoided for a specific reason. I am not really looking g to resell the watch later on so price retention or premium isn’t a concern for me. Thank you.
It's hard for us to say what is best for you. You said you want a 'forever watch' that can go formal or casual (go anywhere do anything). You've picked out 4 nice, but rather different options.
I note that two of the options are chronos with panda style subdials contrast. Is that an aesthetic you're more drawn to?
1 watch is a diver. 1 is connected to racing. 1 is more colorful, and 1 is the Santos which is classic but not for everybody (personally I feel like they're harder to dress down despite all the claims people make).
If one of these feels best to you, do it. Other advice is right, though, try them in first if you can.
...If you want alternatives to consider
A Zenith El Primero is a watch lovers chrono with an amazing history and excellent engineering, and it would compete well with that Brietling on your list, but probably dresses up a little better than the Breitling when you wear a suit. Some people don't like the tri-color dials though.
Omega Aqua Terra is a quintessential (non-Rolex) go anywhere, do anything "sport" watch. Works for literally any occasion except maybe a royal wedding. But, versatility can often be inversely proportional to unique character, and maybe it doesn't speak to you for that reason.