The J44 is actually a much bigger boat, with 5' more waterline, 15-20% more displacement, 3 private sleeping cabins vs. 2, etc.
It's also got more sail area, and might be a handful for a couple on a breezy daysail, but a fast and exciting ride.
Are you cruising or racing? Do you need the room? Can you live with the draft? (the J draws 8', a CB Sabre 42' draws less than 5' board up)
If sailing with more than 4 people was in my plans, or serious racing, I would go with the J. If I was cruising with my wife and kids, I'd rather have the Sabre. If my kids were teens and wanted to bring a gang, I'd pick the J. Both are really good boats.
The active racing fleet has really helped the J's maintain value, but they are good boats anyway.
Either boat, well maintained, would be a joy. Good Luck.
If you look at more recent Sabre 402's or 425's, they are more expensive than the older 42's.