The two languages wey we dey use dey okay, mind you that na English be our official language for Naija, so imo if we have to choose one out of the two languages, na English go make sense pass. Having said that, we don settle this matter a long time ago, i dey communicate with both English and Pidgin for this local board, and i never get any problem with that, so make we leave this matter of language of use for this local board and concentrate on other better things.
I even dey surprised to see this post, because I think something like this don dey discussed here.
Anyways, English is the official language of this forum and the reason for the local board section is to better know those who are here and to better explain to newbies to gain the right understanding, wherein they are free to express themselves in a dialect we as Nigerians understand well, without having to think that an idea is stupid or useless.
There's no hard and fast rule to choosing the most convenient language to express oneself here. We go understand anyhow or any which one you choose to use.