The standard Lemo 2 build, as per the prebuilt coil that comes with it, is around 7/8 wraps of 26g kanthal on a 3mm inner diameter, and that comes out at around 1.1 ohms.
From there you can go anywhere, though with kanthal i always found it best to stick with the default build with kanthal. Theres a reason they made the premade like that, it works best.
One constant is wrapping coils on 3mm inner diameter on the Lemo, it works out to be the best size
Moving on to other wires...
Nickel - Youre going to want about 10/11 wraps on 3mm id to get the right ohms and surface area. the lowest ohmage build ive ever done 0.09, purely for testing, was done using nickel. Dont assume lower results in a better vape, because this wasnt the greatest vape. I know a lot of people are given the impression you arent cool unless youre doing a mental low ohm build, dont assume its true. Nickel is a pain in the bottom to work woth, has some safety concerns....i jettisoned it for stainless many months ago.
Titanium - cant say, i never got any Ti wire..i went straight from kanthal (vw) to nickel (temp control) to stainless steel (vw/temp control)
Stainless Steel - similar to the default kanthal build - about 7/8 wraps on 3mm id will get you about 0.6 ohms and works well whether you use it in power/vw mode, and works great in temperature control as i currently do. You can use SS in either mode, which is a plus. If you do plan to use temperature control and stainless steel, i recommend 0.5+ ohm coils, works best.
Im known for loving my Lemo 2 to death, my poor TFV4 Mini hardly gets used...