OK. How many monkeys and gorillas are going to be jumping around on your table?
I use 5/8" holes for 5/8" dowel pegs. I wet the dowel peg with water, slop it up with Gorilla and slam it home.
The totally bigger issue is the puzzle to get the surfaces to match up (kinda, sorta.)
What? Bed side tables, end tables, work bench tops for wood carving (made of 4x4 cedar) and stuff like that.
As you might imagine, I beat the crapola out of my carving benches with a 32oz lead core mallet, adzes and axes.
Only better is Ready Rod, 3/8" or 1/2" to tie the whole glue-up together. Learn to line those holes up over 16".