So your going with the KR808? So did I.
The subtle difference in my opinion between auto and manual is the the manual you can heat it up a bit before you draw to get a bit more vape. I actually prefer the auto when your busy with your hands. Manual for sittin' on the couch. (I've never had an 808 auto go off for sound or vibration. It seems to be a vacume activated switch. IDK, could be wrong.)
I've never used a short. Not sure why you would, but it may fit in a watch pocket I suppose. The XL's are excelent. They last much longer.
I have 1 xl manual, 2 xl autos, and 2 regular autos and I'm good all day. The only time I really need a PCC is when I travel. I vape more when I drive. (I used to smoke more driving too.) The KR808 VK PCC can not fit the XL batteries. At home, on the computer, I use a passthrough to save my batteries.
I have a usb and a mains charger so I can charge 2 at once.
Oh, also if you order from Vape4Life, be sure to get the cool carts. They are a bit nicer. Hold more liquid w/ rubber end. I like em'.
One last thing, there are adapters so you can try the atomizer/cart route with the 808 batteries. A DS901 or a 501. (Actually, no adapter needed for a DS901.) Tried it, glad I have a KR808. Easy.
Well, thats my experience. I'm happy with the 808.
P.S. I don't do menthol. To each their own.