As a dealer I preferred for bets less than 100 that the player just put out a single stack wo tipping it over. I can quickly break it down in stacks of 5 as our procedures called for. It just wastes time when a player slowly breaks down his chips in stacks of say 3 chips just bc the first bet was 15, a guy raised to 30, and now he's raising to 75.
If the bet is 5 chips or less, you can fan them out if you want. But over that, its faster for me just to get a single stack. An odd thing I'll see players do is when they bet say 65, put out two stacks side by side, and then tip over the stack with with the extra chip. They dont realize that you do that when the stacks are identical, and are showing the camera what is in it. But doing it with unequal stacks doesnt really help anything.
And since I'm listing betting pet peeves, one thing that always amazes me is that a player will have 3 stacks of red, a stack of green, and some odd black chips, and when they bet 250 they will use all red chips. Of course I have to verify the stacks by breaking one down and then break down the 50. Once in a 10/10 plo game with a 25 rock, which plays as a green chip game (bets must be multiples of 25), I had a bet of 375, with 2 callers, and every bets was all red chips, even with stacks of green and black on the table. Then they wonder why hands take so long. So use those higher denomination chips! Or if you want to get rid of the red, ask for a color up! /rant