Cartos are much more convenient, if that's what you're looking for.
I'm afraid you can't escape the occasional juice-in-mouth experience though... It can happen with cartos too, for pretty much exactly the same reasons. Overfilling is the main one. Also, I'll sometimes unintentionally hold my PV horizontally or even slightly tipped downwards while idly vaping at my computer with my elbow resting on something. That doesn't work out too well in my favor.
I've noticed that while vaping, a lot of condensation forms on the inside of the carto and mouthpiece. Usually that will just run back down into the filler. But if you hold it like that... well, gravity does what gravity does. Also, heavy vaping will clog whistle tips with condensation. Doesn't matter how you hold it at that point, might as well be sucking liquid with a straw. So if you use whistle tips, you gotta keep an eye on them and clean them out every now and then.