Royal County

Visited One Leaf Troy last week and it's move-in ready, which is great, no more rent headaches. I'm so fed up of renting, finally taking the plunge. One Leaf is around 35L all-in. But then Royal County looks tempting too, though it's still ongoing at about 50L. Is the immediate possession of One Leaf better than Royal County's potential 5-year appreciation? What about the total cost of ownership for Royal County with the under-construction risks? Should I go for immediate possession or gamble on future appreciation?