This is a question often asked and really I think it depends on how you want your rug to feel underfoot, how much money you have to spend on wool, (the higher the loops the bigger the wool bill) the effect you wish to achieve. Nothing else really matters, we all sort of have a a personal level we pull loops to somewhat like knitters have tension.
If we look at a hooking and keep seeing the loops, something went awry, we aren't noticing what was depicted.
The loops are the least of it.
Colour and it's effective use is what counts in my mind and to my eye.
What do you think ?