Choosing a style. Can you help us?

We have the established illustration style for our promo pages and UIs (icon on the left). We want to upgrade it (icon on the right), but we're not sure if it'll work. You can see more details in the attachment - https://d13yacurqjgara.cloudfront.net/users/120400/screenshots/2071562/attachments/371461/127-BOX_ALL.jpg

What do you think? Which one is better and why?