Thread is significantly better. Zigbee relied on proprietary hubs and apps or hacky work arounds. Matter over thread devices don't need a brand specific hub or app. You can literally control the new ikea products direct from a modern iphone which includes a thread radio, no hub, server or app required.
If you already own the ikea hub, they secretly put thread radio in it which was just sitting unused in preparation for this range.
If you already own the ikea hub, they secretly put thread radio in it which was just sitting unused in preparation for this range.