This head-to-head is in testing right now. Dennis is running the XMAX Ace and the Smono 4 Pro side by side through our standard protocol — vapour quality, flavour, battery life, ease of use, maintenance and value for money.

The full comparison, with scores and a clear verdict on which one deserves your money, will be published here soon.

While you wait, read our full individual reviews: XMAX Ace review and Smono 4 Pro review — or browse every published comparison on the Head-to-Head hub.