Did the same recently.
We have cable to most rooms so mesh didn’t make sense to me. I went with Ubiquiti UniFi in the end. A security gateway, managed switch, and wifi access point. Access point covers way more of the house than I was expecting. Was planning on needing one or two more, but one covers it all (that’s three floors from an AP on the ground floor). Lateral coverage isn’t quite as good – garden is a little weak.
Very nice management tools as well for security, multiple networks, etc if you need that.
If it’s only the wifi aspect of the Virgin box you want to improve you could just try the UniFi AP without their router and switch. Just leave Virgin as is but turn off WiFi.