If you have a short wick, you will be required to tilt the atty when the juice gets low. I know many use shortened wicks in order to help avoid dry hits and to promote chain vaping. However in my experience, on both the limitless and avocado, I found that length is irrelevant if I just make sure the tails are nice and fluffy. By doing so I haven't had any performance differences between long vs short.
The main reason for the shortened wicks is capacity, you eat up the already smaller capacity tank's space with the extra cotton. But, yeah tilting/flipping upside down, really not any form of hassle, personally usually I get enough juice touching the wicks just vaping it normally as I don't bend my head down to vape (do people do that?).
Anyways, yeah either of those are great (avocado/limitless), and the Boreas is a great option as well. The 22mm Griffin is still treating me very nicely, great on flavor with the build I have. I'm a fan of the Diablo RTAs I have as well, small, compact, but really pack the flavor.