Hello and welcome to BYC. I will let those with knowledge of both commercial strains advise.
More generally, this is a useful link of “How to” BYC guides to take a look at announcements-feedback-issues-guides.3. I’d suggest including your location using the guide in the link. You can use this link to contact members in your area - Find your State's thread.
I really don’t know of a difference in the two hybrid breeds and some people use the name interchangeably confusing the two crosses more. The Isa Brown uses a RIR with Rhode Island Whites. The Golden Comet crosses the New Hampshire Red with Rock White. All good layers for 250 plus eggs per year. Breed weight about 4 pounds. So many variables determine laying ability each year including genetics, nutrition, environment, and care. All higher production birds lay well 2-3 years then drop down in productivity each year older. That’s why farmers may buy new layers every couple years to avoid production drops in flock. My chickens are pets and are here till their lifespan is over which on average is 8 years but some hens have lived longer. Some farmers cull when drop in production or Good to have plan in advance how to handle production drops.
my understanding is that red sex links on average lay until their 2.5-3 years and then petter off. Especially if their mix includes a leghorn. They just produce fast and burn out quick.