Most projects it depends on what I'm making, but I'm always using up the leftovers into scrap pieces for scrap afghans and I always use G hooks for those. That way I never have to guess what hook I was using for them. Right now I'm making a Spiderman Round Robin with H, a 'larger scrap' afghan with J, hats with H, and the smaller scrap pieces with G. And the hooks always stay with the project. If I put it aside for a while, the hook stays with it. That's why I have so many of each size, How many times do I have to explain that to the hubby? LOL
Me: "I need to buy some yarn and another crochet hook"
My boyfriend "Don't you already have like 10 of them
Me: "They come in different sizes"
Boyfriend "...how many???" because he knows I will not stop until I have them all! MWAHAHAHAH
But...like he should talk. I collect crochet hooks and knitting needles. He collects guitars. GUITARS! Knitting needles and crochet hooks--like 5 dollars max. Guitar...THOUSANDS!