’‘it has enough quality for clients that doesnt have vision’'
It kinda sucks to work on bad projects for clients that sucks, no? If I had the choice between doing 1 high end viz with vray vs 10 average viz with ue4, I’d choose vray! You gotta enjoy your craft man!
But hopefully real-time continue to improve because the workflow is just way more fun than with offline renderer.
By the way try Corona. Imo it blows vray out of the water for architecture 
And their interactive preview renderer is almost like having a real-time preview hehe!