I have more flavors than baskin robbins. And it depends on what I'm doing as to what my favorite PV is.
Here's a pretty normal day:
Get up and drip something sweet like massive choco mint or pg hype from AVE in a 2.0 ohm cisco atty on a box mod or a rough stack @ 3.7v. There's always a MAP tank laying around my desk with vanilla from BWB or mint orange (mandarin orange and spearmint 50/50) from madvapes so one of those will get a few puffs as well while I'm filling a couple of cartos to get the days started.
If I'm working outside, I bring a maxi rough stack with a 1.7 ohm single coil loaded with maybe BWB casablanca or BWB Maple Tobacco, a spare carto and a 3ml bottle. Or, I'll use a ni-mh battery in the maxi RS with a dual coil and maybe BWB Applewood or Madvapes TopVapor Caramel Tobacco. If I'm working inside, I often bring a bottom feeder (just got a REO Mini a couple of days ago - nice mod and appears to be durable enough to take for outside work days, so there might be more feeder days) with either a 2.0 ohm cisco atty or a 1.8 ohm boge carto and maybe AVE Gorilla Juice or BWB Adarondack.
If I'm around the office at all after lunch, I like to have something sweet like BWB Cherry Tobacco or some straight Spearmint from Madvapes usually from a 2.0 ohm single coil carto on one of the non-descript flashlight or copper tube mods I keep at work. And, I also keep a MAP tank at work that often has Banana Waffle (60/40 TopVapor banana and waffle). A buddy of mine does DIY so I've been on a lunchtime caramel cream kick. He makes good juice.
When I get home, I like to relax for just a little while and often use a dual coil carto tank with one tobacco flavor or another. I have one full of BWB Applewood and one full of some Turkish Blend tobacco juice that I forgot where it came from. The Applewood is good at 5.0v and the Turkish does pretty well up to 6.0v, so the carto tanks are currently on a Maxi RS @ 6.0v and my Triple-V @ 5.0v.
Throughout the evening, I might be vaping just about anything. I have around a dozen mods and a whole bunch of ego and ego clones laying around. They've got tanks, attys, and cartos on them all the time, so I grab whatever is handy. I guess I've had my VV box in my hand a lot lately with either a dual coil on it or a 2.0 ohm boge that has gotten near the end of its life and needs a little extra voltage to go a little longer.
After dinner, I've been vaping a lot of AVE 555 lately, usually from a 1.8 ohm boge on one of the 3.7v PVs.
The last two or three hours of every day, I drip bobas bounty. It's almost always at 3.7v, but the atty might be anything. I always have a 1.5 ohm 306, a 1.7 ohm cisco 510, a 2.0 ohm cisco 510, a 2.0 ohm smoke tech bridgeless 510, and a 2.4 ohm joye 510 ready to go. -
That's how my days pretty much go. I don't have an "all day vape". I don't have a favorite voltage. And, any PV that hasn't lived up to my expectations has gone to the bone pile in the junk drawer. I like variety - and I keep supplies on hand to satisfy that desire. In fact, just because I hadn't thought about it in a while but it came up in this reply - I'm going to fill three 3.2 ohm single coil cartos before bed with two tobaccos and a sweet juice - or maybe a tobacco, a fruit, and a sweet. I think I'll carry my triple-V tomorrow. It hasn't been out of the house in a while, and I'll only be around family so I won't get those weird looks I sometimes get from people when I'm vaping a huge tube mod in public.
I don't suppose that's the sort of answer you were looking for, but I've met at least a few other people like me here on ECF, so I think it was a valid answer.
What's your favorite vaping piece and e-liquid, or at least the one combo you use the most? I tend to really gravitate to one or two flavors during the day, but I do like to change it up. 
