it's a long standing debate. you really can't get a definite answer as there are different studies and opinions about this topic.
even different states in the US have different policies on for use of wooden chopping boards over poly boards.
i have different knives with different handles. untreated, treated, stabilized, unstabilized, micarta, synthetics etc.
i like the feel of wood and micarta the best. stabilized woods feel plastic-y. certain woods feel warmer than others. handle material is a factor for me. the treatment used in treated wood might end up seeping in the food if you're not careful, so that's gonna be a problem if it's not done correctly (treating of the wood).....