I heard innokin only uses tape on their electrical connections and not solder. I say go Provari unless you are electrician.
You heard? Seriously? Tape?
How long would they be in business if that were true? They're a global industry GIANT.
Besides, they are CE-Spec electronic devices. They not only have to have soldered connections, but must use specific solders, fluxes, techniques, and testing methods at pre-determined limits in order to have their products imported into the EU/USA.
Tell whoever you "heard" that from to snap out of it.