Since no one has responded I’ll offer some feedback.
Do you already have a C3 WH? If so, it seems you would know the answers.
A C3 offers better PVE isk than a C2. For that reason, it probably offers a better chance of catching someone running the PVE. C2 PvE income is not very isk/hour efficient.
Gila is a good choice for running C2 PvE, but drake, myrm and gnosis are effective if you want to use a BC.
Tengu and MJD RS are best choices for solo C3, but you can use lesser multiple ships.
Chances are good for keeping an astrahus alive in low-class if the hole looks active and you don’t trash talk needlessly.
See this doc for figuring out isk & difficulty of WH sites: Rykki Guide
p.s. Don’t forget to check the effects of a hole you are considering.