Convection works like an oven to heat the herb using warm air. Conduction uses coils to heat the herb but poses additional of a risk of accidental combustion once the herb is available in direct connection with the coil. (Go through additional listed here!) The Venty packs a nice mix https://israeldudkh.ziblogs.com/37812642/the-smart-trick-of-best-dry-herb-vaporizer-uk-that-nobody-is-discussing