it is always better to sell with vacant possesion....
viewing time is so so flexible
those units tat is tenanted damn difficult to make viewing arrangements....totally turns buyers off
till date...i nvr bot a unit tat comes with tenancy.....so for me, i prefer vacant unit be it in prime districts
just to add, sometimes tenanted units prices r very firm...bcoz sellers got rental income...no hurry to sell wat....on the other hand, viewing time is flexible and attract bigger pool of buyers(own stay or investors)...may fetch higher price too...so conclusion: doesnt matter at all!