I think it's more about what it is better known for, rather what it really means. Gore MEANS graphic and bloody violence, but the term is often used for "live-action" or real life scenes depicting any sort of death or serious injury. Guro MEANS "grotesque" and originally was referred as "Ero-guro" or "erotically grotesque". In the beginning guro only was about pretty weird and disgusting fetishes (mostly in manga or anime). Nowadays is more known for deaths and blood even without sex or eroticism involved. But guro still is better known as the anime counterpart of gore.

What do I enjoy the most? Gore is sometimes pretty exciting to me as long it's not real life shit (like those rekt, accidents or executions videos). When it comes to guro on the other hand, I like pretty much everything about it (except for furry and yaoi stuff).