@mamckay41 I'm not one of those who get puppy blues. I enjoy my puppies. Over the years I've gotten puppies at 7, 8, 11, 12, and 16 weeks. The 7-week-old one was the only one who caused anything approaching puppy blues, but I was working full time then and wasn't for the others.
Anyway, the older puppies were easier on me, but that didn't have as much to do with bonding as how well temperaments and personalities ended up suiting. That's hard to tell in puppies. My last 3 Rottweilers all had the Volhard Puppy Aptitude Test administered, and there were still surprises.
I never had to choose between age differences but did have to choose between two puppies in the same litter a couple of times. Giving up on logical pros and cons and going with my heart worked for me. I chose the best dog I ever had over her sister that way. The litter was across the yard. I called, "Puppy, puppy," and she was the one who raced to me.