I'm personally having great vapor from a 3Ω Boge right now in an AGR tank on my Provari. Couldn't ask for better performance really. Running at 5 volts.
As for eGo I personally like to stay in the 2.2 - 2.8 range when I'm wrapping the coil. 2.8Ω on a Twist may restrict the wattage potential, as you'll just get to around 8 watts before you can't dial the voltage up further. I then do the "Ohms + 2" so say 4.5v and adjust to taste.
To get the vapor I'm used to, if I were to use a cig-a-like I'd probably go with LR. If I wanted to balance battery life & performance I'd go with the 2.4Ω range.