The e-liquid (or vape juice) doesn't have a big effect on the clouds/smoke produced. I've found that juices with more PG than VG give me thicker clouds/smoke. I'm a vaper who loves to mess around with tricks. I've done research in the past, unable to find answers to questions like yours. So I started experimenting myself. e-liquids/vape juice that have more PG will give you a thicker cloud. I try to find juices that run about PG 30/70 VG.
Also, just a little side note, juices with more PG will wick your cotton faster. (Higher PG juices are usually a lot thinner)
I hoped this helped