Unreal or Unity for Architectural Walk-through - Please Help


Hi Guys, I am a architectural 3D developer. Using 3D Studio Max I did lot of animation and stills for my client. Recently I am getting few requirements about real time walk-through so have to upgrade myself in that particular domain. So which game engine will be perfect suitable for Arc Viz real-time walk-through.

Once I was planning to buy Lumion but came to know that it doesn’t do the realtime things.

Please help…