The ones I know about are Innokin stuff, DNA30 mods, Semovar (Nivel chip), and ProVari. Of these, I choose ProVari (I have 3), and I might want a Semovar in the future. I am also a fan of the VTR. I don't vape at high enough watts to justify the cost of a DNA30, but, if I did, I like the looks of the ZNA.
I have never used a sigelei, so I can't help you there.
not all innokin stuff is created equally.
the mvp and vv3 both have stronger chips than the VTR and the tube models.